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Infection and Immunity, February 2003, p. 733-738, Vol. 71, No. 2
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.2.733-738.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Role of Systemic and Mucosal Immune Responses in Reciprocal Protection against Bordetella pertussis and Bordetella parapertussis in a Murine Model of Respiratory Infection

Mineo Watanabe^1* and Masaaki Nagai²

Department of Microbiology and Biologicals, Daiichi College of Pharmaceutical Sciences, Fukuoka 815-8511,¹ Research Center for Biologicals, The Kitasato Institute, Kitamoto 364-0026, Japan²

Received 26 August 2002/ Returned for modification 23 October 2002/ Accepted 14 November 2002

Top Abstract Introduction Materials and Methods Results Discussion References

 
The roles of systemic humoral immunity, cell-mediated immunity, and mucosal immunity in reciprocal protective immunity against Bordetella pertussis and Bordetella parapertussis were examined by using a murine model of respiratory infection. Passive immunization with serum from mice infected with B. pertussis established protective immunity against B. pertussis but not against B. parapertussis. Protection against B. parapertussis was induced in mice that had been injected with serum from mice infected with B. parapertussis but not from mice infected with B. pertussis. Adoptive transfer of spleen cells from mice infected with B. pertussis or B. parapertussis also failed to confer reciprocal protection. To examine the role of mucosal immunity in reciprocal protection, mice were infected with preparations of either B. pertussis or B. parapertussis, each of which had been incubated with the bronchoalveolar wash of mice that were convalescing after infection with B. pertussis or B. parapertussis. Such incubation conferred reciprocal protection against B. pertussis and B. parapertussis on infected mice. The data suggest that mucosal immunity including secreted immunoglobulin A in the lungs might play an important role in reciprocal protective immunity in this murine model of respiratory infection.

Top Abstract Introduction Materials and Methods Results Discussion References

 
Whooping cough caused by Bordetella pertussis is a serious contagious disease in children. The incidence of whooping cough has decreased markedly since the introduction of commercial pertussis vaccines (2, 5). However, several studies have suggested that pertussis vaccines have little or no ability to protect against Bordetella parapertussis, which also causes symptoms typical of whooping cough (6, 7, 9, 10, 17, 14, 22). Thus, it appears that no significant reciprocal protective immunity between B. pertussis and B. parapertussis is established by subcutaneous or peritoneal vaccination, most probably because immunization by injection does not effectively activate mucosal and Th1 responses (8, 12, 13, 15). In a previous study, we demonstrated that reciprocal protection is induced in mice infected with B. pertussis and in mice infected with B. parapertussis in a murine model of respiratory infection (20). This study also suggested that humoral immunity, cell-mediated immunity, and/or mucosal immunity against filamentous hemagglutinin (FHA) might be related to reciprocal protection. These data are important with respect to efforts to produce a vaccine that is effective not only against B. pertussis but also against B. parapertussis.

As part of our efforts to design an effective vaccine for protection against both B. pertussis and B. parapertussis, we examined the roles of the systemic humoral immune response, the cell-mediated immune response, and the mucosal immune response in reciprocal protection in a murine model of respiratory infection.

Top Abstract Introduction Materials and Methods Results Discussion References

 
Mice. Specific-pathogen-free female dd-Y and BALB/c (H-2^d) mice were obtained from Japan SLC (Hamamatsu, Japan). The mice were maintained under specific-pathogen-free conditions. All mice were 4 weeks old at the start of experiments.

Bacterial strains and culture conditions. The phase I strain of B. pertussis strain 18-323 and B. parapertussis strain 23054 were used in this study. Cells were grown at 37°C on Bordet-Gengou (BG) agar supplemented with 20% (vol/vol) defibrinated horse blood.

Aerosol infection. Infection by an aerosol of B. pertussis or B. parapertussis was achieved by a previously described method (19-21). B. pertussis and B. parapertussis were cultured separately on BG plates for 30 h at 37°C. The cells were then harvested in phosphate-buffered saline (PBS) on ice, and each suspension of cells was adjusted to 10¹⁰ cells/ml after measurement of the optical density at 660 nm. Four-week-old mice were allowed to inhale the suspension for 45 min in a sealed aerosol chamber within a biosafety cabinet (MHE-130B1; Sanyo Electric, Moriguchi, Japan). The number of viable Bordetella cells in each mouse lung after such treatment was approximately 10⁵ CFU. Convalescent mice were maintained in individual cages for 6 weeks after infection with B. pertussis or B. parapertussis.

Quantitation of bacteria in lungs. After sacrifice, the lungs of mice were dissected out and homogenized in 10 ml of PBS per lung in a Teflon homogenizer on ice. Serial dilutions of each lung homogenate were spread on BG plates, and cells were cultured for 4 days at 37°C. The number of CFU was used to estimate the number of bacteria. The limit of detection of this method was 10² CFU/lung (19-21).

Assay of protective immunity. Protective immunity was determined as described previously (20). Mice were infected via the respiratory tract by an aerosol of B. pertussis or B. parapertussis. Two weeks after infection, the lungs of each mouse were surgically removed and homogenized in PBS in a Teflon homogenizer on ice. The number of CFU was determined as described above.

Passive transfer of serum. Serum of nonimmunized control dd-Y mice and of convalescent mice, which had been maintained for 6 weeks after infection with B. pertussis or B. parapertussis, was prepared for passive immunization. Aliquots of serum (0.4 ml) were injected intravenously into individual 10-week-old dd-Y mice 4 h before aerosol challenge for the assay of protective immunity (12).

Adoptive transfer of spleen cells. Adoptive transfer of spleen cells was performed by a modified version of the method of Mills et al. (12). Convalescent BALB/c mice that had been maintained for 6 weeks after infection with B. pertussis or B. parapertussis were used as donors of "immune" spleen cells. Spleens were removed surgically and aseptically from controls and from convalescent mice, and then single-cell suspensions were prepared. Single-cell suspensions, including cells equal to one spleen from a control mouse or a convalescent mouse, were injected intraperitoneally into recipient 10-week-old BALB/c mice that had been irradiated with sublethal dose of 6 Gy of total body irradiation. After the transfer of spleen cells, the immunity of each mouse to B. pertussis and B. parapertussis was determined as described above.

Bronchoalveolar washes. Bronchoalveolar washes of convalescent and control dd-Y mice were collected by washing excised trachea and lungs three times with 300 µl of PBS. Approximately 700 µl of bronchoalveolar wash was recovered from each mouse (1). There was little or no contamination with blood, as judged by the hemoglobin content of each wash. The bronchoalveolar washes from mice in individual groups were pooled and stored at -25°C prior to use.

Determination of the protective effect of the bronchoalveolar wash. After B. pertussis or B. parapertussis cells had been cultured on BG plates for 30 h at 37°C, they were harvested in PBS on ice. Individual suspensions of cells were adjusted to 10¹⁰ cells/ml. Five milliliters of suspension was added to 5 ml of pooled bronchoalveolar wash from convalescent mice that had previously been infected with B. pertussis or with B. parapertussis. Then the mixture was incubated for 30 min at 37°C. The pooled bronchoalveolar washes from noninfected mice were used as the control bronchoalveolar washes. The number of CFU in each suspension was not reduced by this incubation. Four-week-old dd-Y mice were then allowed to inhale the suspension that had been incubated with the bronchoalveolar wash. The number of viable Bordetella cells in each mouse lung after such treatment was approximately 10⁵ CFU. Two weeks after infection, the CFU in lungs were counted as described above.

Quantitation of antibodies against whole cells of B. pertussis and of B. parapertussis. Preparations of killed-whole-cell B. pertussis or B. parapertussis antigens were prepared with formalin as described previously (20). Cells were suspended in 0.05 M carbonate buffer, pH 9.4 (3 x 10⁹ cells/ml). The 100-µl aliquots of a suspension of killed whole cells of B. pertussis or B. parapertussis were placed in individual wells of 96-well flat-bottom AquaBind plates (Asahi Techno Glass Co., Tokyo, Japan) (4). After incubation for 30 min at 37°C, the plates were washed three times with 300 µl of 0.5 M NaCl that contained 1% (vol/vol) Triton X-100 and each well was coated with 300 µl of 0.05 M carbonate buffer that contained 15% (wt/vol) polyethylene glycol 4000 (Sigma, St. Louis, Mo.), 1% (wt/vol) bovine serum albumin (Invitrogen Corp., Carlsbad, Calif.), and 10 mM ethanolamine. After overnight incubation at room temperature, the plate was washed three times with PBS that contained 0.1% (vol/vol) Tween 20 (PBS-TW). Then 100 µl of 50-fold-diluted serum or lung homogenate from a convalescent mouse was added to each well. The plate was then incubated for 1 h at 37°C and washed four times with PBS-TW. Next, 100 µl of 1,000-fold-diluted peroxidase-conjugated antibodies raised in goats against mouse immunoglobulin G (IgG) or IgA (Sigma) was added to each well. The plate was incubated for 1 h at 37°C and washed four times with PBS-TW. Then 100 µl of 3,3',5,5'-tetramethylbenzidine solution (Pierce, Rockford, Ill.) was placed in each well, and the plate was incubated for 20 min at room temperature. The reaction was stopped by the addition of 100 µl of 1 M sulfuric acid. The absorbance of the solution in each well was measured at 450 nm. The antibody response was expressed as the mean absorbance from four samples (optical density at 450 nm).

Statistical analysis. The statistical significance of differences between results from different groups was examined by Student's t test. Probability values of <0.05 were considered evidence of statistical significance.

Top Abstract Introduction Materials and Methods Results Discussion References

 
Protective effects of the passive transfer of serum. Mice injected with serum from mice infected with B. pertussis and mice injected with serum from mice infected with B. parapertussis were challenged with an aerosol of B. pertussis. Two weeks after the challenge, the number of CFU in the lungs of each mouse was determined as described in Materials and Methods. The number of CFU in the lungs of control mice was approximately 10^6.6 (Fig. 1A). For mice injected with serum from mice that had been infected with B. pertussis and for mice injected with serum from mice that had been infected with B. parapertussis, the numbers of CFU in lungs were approximately 10^5.9 and 10^6.6, respectively (Fig. 1A). There was a significant difference between the results for the control group and those for mice that had been passively immunized with B. pertussis-specific antiserum. No difference between the results for the control group and those for mice that had been passively immunized with B. parapertussis-specific antiserum was detected. The data suggested that protection against B. pertussis had been established by passive immunization with serum from mice infected with B. pertussis but not with serum from mice infected with B. parapertussis.

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FIG. 1. Protection of mice injected with serum from mice convalescing after infection with B. pertussis or B. parapertussis. Mice were passively immunized by injection of serum from nonimmune control mice (control), from mice infected with B. pertussis (BP), and from mice infected with B. parapertussis (BPP). Then they were challenged with an aerosol of B. pertussis (A) or B. parapertussis (B). Two weeks later, the numbers of CFU in lungs of mice were counted. The results shown are mean values per lung, as estimated from individual lungs of four mice in each group, plus standard deviations. *, P < 0.05 versus the control group.

We next examined protection against B. parapertussis. Protective immunity against B. parapertussis was detected in mice that had been immunized with serum from mice infected with B. parapertussis but not in mice that had been immunized with serum from mice infected with B. pertussis (Fig. 1B). The numbers of CFU in lungs of control mice, mice immunized with B. pertussis-specific antiserum, and mice immunized with B. parapertussis-specific antiserum were approximately 10^5.9, 10^5.8, and 10^3.9, respectively. There was a significant difference between the results for the control group and the results for mice that had been passively immunized with B. parapertussis-specific antiserum. No difference between the results for the control mice and those for mice that had been passively immunized with B. pertussis-specific antiserum was detected. The data indicate that protection against B. parapertussis was established by passive immunization with serum from mice infected with B. parapertussis but not by passive immunization with serum from mice infected with B. pertussis.

Protective effects of the adoptive transfer of spleen cells. For the experiment involving adoptive transfer of spleen cells, we used inbred mice (BALB/c mice), which are suitable for this procedure. Spleen cells from nonimmune control mice or from convalescent mice, which had been infected with B. pertussis or with B. parapertussis, were injected into recipient mice. Two weeks after recipient mice had been challenged with B. pertussis, the numbers of CFU in the lungs of recipients were counted. The number of CFU in the lungs of control mice, which had been injected with nonimmune control cells, was approximately 10^5.6 (Fig. 2A). For mice injected with spleen cells from mice infected with B. pertussis and from mice infected with B. parapertussis, the numbers of CFU were approximately 10^3.4 and 10^5.6, respectively (Fig. 2A). A significant difference between the control group and the group of mice injected with spleen cells from mice that had been infected with B. pertussis was detected (P < 0.05). There was no significant difference between the control group and the group injected with spleen cells from mice that had been infected with B. parapertussis.

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FIG. 2. Adoptive transfer of immune spleen cells for protection of recipient mice against B. pertussis and B. parapertussis. Mice were injected with spleen cells from nonimmune control mice (control), from mice infected with B. pertussis (BP), and from mice infected with B. parapertussis (BPP) and then challenged with an aerosol of B. pertussis (A) or B. parapertussis (B). Two weeks later, the numbers of CFU in the lungs of recipient mice were counted. The results shown are mean values per lung, as estimated from individual lungs of four mice in each group, plus standard deviations. *, P < 0.05 versus the control group.

We next examined the protection against B. parapertussis in mice that had been injected with spleen cells from immune mice. Two weeks after an aerosol challenge with B. parapertussis, the numbers of CFU in lungs of mice injected with spleen cells from nonimmune control mice, from mice infected with B. pertussis, and from mice infected with B. parapertussis were 10^5.8, 10^5.4, and 10^5.1, respectively (Fig. 2B). There was a significant difference between the control group and the group injected with spleen cells from mice that had been infected with B. parapertussis (P < 0.05).

These data suggest that cell-mediated immunity, which was transferred to recipients by injection of spleen cells from mice that had been infected with B. pertussis, had a protective effect against B. pertussis but not against B. parapertussis.

Role of mucosal immunity in protection. To determine the role of mucosal immunity in reciprocal protection, we infected mice with an aerosol of B. pertussis or B. parapertussis cells that had been incubated with the pooled bronchoalveolar washes of nonimmune control mice or of immune mice, as described in Materials and Methods. Viable B. pertussis cells were incubated for 30 min at 37°C with the pooled bronchoalveolar washes of nonimmune control mice, of mice infected with B. pertussis, or of mice infected with B. parapertussis. The number of CFU in each suspension of cells was not reduced by such incubation, and there were no significant differences among the numbers of CFU in these suspensions. Four-week-old dd-Y mice were allowed to inhale an aerosol of each suspension. Initially, the numbers of viable bacteria in the lungs of all the mice were very similar (approximately 10^4.7 CFU). Two weeks after the aerosol challenge, we counted the CFU in the lungs. In the group that had inhaled B. pertussis that had been incubated with the bronchoalveolar wash of nonimmune control mice, the number of CFU was approximately 10^6.8 (Fig. 3A). The numbers of CFU in the mice that had inhaled cells incubated with the bronchoalveolar wash of mice infected with B. pertussis and of mice infected with B. parapertussis were approximately 10^6.0 and 10^5.9, respectively (Fig. 3A). There was a significant difference between the results for the control group and the results for each experimental group (P < 0.05). The results suggest that protection against B. pertussis was established by mucosal antibodies induced during convalescence from infection by B. pertussis or by B. parapertussis.

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FIG. 3. Protective effects against B. pertussis and B. parapertussis of mucosal antibodies produced by mice infected with B. pertussis and by mice infected with B. parapertussis. Mice were infected with an aerosol of B. pertussis (A) or B. parapertussis (B) which had been incubated with the pooled bronchoalveolar washes of nonimmune control mice (control), mice infected with B. pertussis (BP), or mice infected with B. parapertussis (BPP), as described in Materials and Methods. Two weeks later, the numbers of CFU in lungs of mice were counted. The results shown are mean values per lung, as estimated from individual lungs of four mice in each group, plus standard deviations. *, P < 0.05 versus the control group.

We next examined the role of mucosal immunity in protection against B. parapertussis. Viable B. parapertussis cells were incubated with the pooled bronchoalveolar washes of nonimmune control mice, of mice infected with B. pertussis, or of mice infected with B. parapertussis and then challenged with the preparation of B. parapertussis. During incubation of viable B. parapertussis cells with the various bronchoalveolar washes, the number of CFU in each suspension remained unchanged, and there were no significant differences among the initial numbers of CFU in the lungs of mice in each group (approximately 10^5.5 CFU). The numbers of CFU of B. parapertussis in mice that had inhaled cells exposed to the bronchoalveolar wash of nonimmune control mice, of mice infected with B. pertussis, and of mice infected with B. parapertussis were approximately 10^6.6, 10^5.1, and 10^5.6, respectively, 2 weeks after the challenge (Fig. 3B). There was a significant difference between the results for the control group and each experimental group (P < 0.05).

Levels of antibodies against B. pertussis and against B. parapertussis. We examined the antibody responses against whole cells of B. pertussis and of B. parapertussis by enzyme-linked immunosorbent assays. As shown in Fig. 4A, significant levels of IgG antibodies against whole cells of B. pertussis were detected only in the serum of mice infected with B. pertussis (P < 0.05). However, IgA antibodies against whole cells of B. pertussis in lungs were detected at significant levels not only in mice infected with B. pertussis but also in mice infected with B. parapertussis (Fig. 4B). Furthermore, IgG antibodies against whole cells of B. parapertussis were detected at significant levels in the serum of mice infected with B. parapertussis (Fig. 5A). Tenfold-lower levels of IgG antibodies against whole cells of B. parapertussis were found in the serum of mice infected with B. pertussis, but this difference was not significant (P > 0.05). Significant levels of IgA antibodies against whole cells of B. parapertussis were detected not only in homogenates of lungs from mice that had been infected with B. parapertussis but also in those from mice that had been infected with B. pertussis (Fig. 5B).

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FIG. 4. Antibody responses specific for whole cells of B. pertussis in mice infected with B. pertussis and in mice infected with B. parapertussis. (A) Levels of B. pertussis-specific serum IgG in 50-fold-diluted serum from control mice (control), from mice infected with B. pertussis (BP), and from mice infected with B. parapertussis (BPP). (B) Tenfold-diluted lung homogenates of lungs from control mice, from mice infected with B. pertussis, and from mice infected with B. parapertussis examined for the presence of B. pertussis-specific lung IgA. The results shown are mean values, as estimated from individual samples from four mice in each group, plus standard deviations. *, P < 0.05 versus the control group.

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FIG. 5. Antibody responses specific for whole cells of B. parapertussis in mice infected with B. pertussis and in mice infected with B. parapertussis. (A) Levels of B. parapertussis-specific serum IgG in 50-fold-diluted serum from control mice (control), from mice infected with B. pertussis (BP), and from mice infected with B. parapertussis (BPP). (B) Tenfold-diluted homogenates of lungs from control mice, from mice infected with B. pertussis, and from mice infected with B. parapertussis examined for the presence of B. parapertussis-specific lung IgA. The results shown are mean values, as estimated from individual samples from four mice in each group, plus standard deviations. *, P < 0.05 versus the control group.

Top Abstract Introduction Materials and Methods Results Discussion References

 
Both B. parapertussis and B. pertussis cause whooping cough. Pertussis vaccines have decreased the incidence of whooping cough, but they may have little or no efficacy against B. parapertussis (6, 7, 9, 10, 17, 22). For the prevention of whooping cough caused by both species of Bordetella, pertussis vaccines should protect effectively not only against B. pertussis but also against B. parapertussis. We demonstrated previously that reciprocal protection is induced in mice infected with B. pertussis and in mice infected with B. parapertussis in a murine model of respiratory infection (20). Our observations suggested the possible development of a vaccine that would be effective not only against B. pertussis but also against B. parapertussis. In the present study, we examined the roles of the systemic humoral immune response, the cell-mediated immune response, and the mucosal immune response in reciprocal protection in our murine model of respiratory infection.

To characterize the role of serum antibodies in reciprocal protective immunity, we examined the protection against B. pertussis in mice injected with serum of mice that had been infected with B. pertussis or with B. parapertussis. We found that serum from mice infected with B. pertussis conferred significant protection against B. pertussis but not against B. parapertussis. Serum from mice infected with B. parapertussis protected mice against B. parapertussis but not against B. pertussis. These data suggest that serum antibodies from convalescent mice do not play a significant role in reciprocal protection against B. pertussis and B. parapertussis. It is known that pertussis vaccines that are administered by injection induce a serum antibody response for the most part (8). Our results suggest that pertussis vaccines are not useful for protection against B. parapertussis infection.

The adoptive transfer of spleen cells from convalescent mice revealed that mice injected with spleen cells from mice infected with B. pertussis were protected against B. pertussis. Injection of spleen cells from mice infected with B. parapertussis protected recipients against B. parapertussis. However, we did not detect any reciprocal protection against B. pertussis and B. parapertussis. We postulated, in our previous report (20), that FHA-specific serum antibodies and cell-mediated immunity against FHA might be related to the reciprocal protection. However, these factors might play a minimal role in reciprocal immunity, as indicated by the results of the present study. It is now necessary to examine the protective effects of FHA-specific antiserum and the corresponding splenocytes by using FHA from B. pertussis and B. parapertussis.

The numbers of CFU in lungs of mice were influenced by incubation of the pathogens, prior to inhalation, with the bronchoalveolar washes of mice infected with B. pertussis or with B. parapertussis. For challenges by B. pertussis that had been incubated with the bronchoalveolar washes of mice infected with B. pertussis or with B. parapertussis, the numbers of CFU in lungs were lower than the numbers of CFU in the lungs of control mice. We detected a decrease in the number of CFU in mouse lungs after a challenge with B. parapertussis that had been incubated with the bronchoalveolar washes of mice infected with B. pertussis or with B. parapertussis. These data suggest that mucosal immune responses, which include secreted antibodies, might be involved in reciprocal protection against B. pertussis and B. parapertussis. The protective effect of the bronchoalveolar washes of Bordetella-infected mice was significant but, nonetheless, weak. There was a difference in the ratio of the number of bronchoalveolar washes and the number of live cells of Bordetella in the lungs of aerosol-challenged mice in this experiment. In our aerosol infection model, mice were infected with approximately 10⁵ CFU/mouse. In this case, the bronchoalveolar wash of one mouse was used and so the ratio of washes to bacterial number was 1 wash to 10⁵ CFU. However, for the incubation of Bordetella cells with bronchoalveolar washes, we incubated the bronchoalveolar washes from seven mice with approximately 5 x 10⁹ CFU of live Bordetella cells. In this case, the ratio was 7 washes to 5 x 10⁹ CFU (1 wash to 7 x 10⁸ CFU). It was thought that the concentration of factors related to protection in the latter case might be about 7 x 10³ times lower than that in the former case. We examined the levels of IgG and IgA antibodies against whole cells of B. pertussis and of B. parapertussis. We did not detect cross-reactions between the sera from mice infected with B. pertussis and sera from mice infected with B. parapertussis. However, partial cross-reactions between lung homogenates from mice infected with B. pertussis and those from mice infected with B. parapertussis were detected. It has been reported that secretory IgA antibodies, induced by natural infection, are effective in achieving cross-protection against infection with heterologous influenza virus (11). However, although serum IgG antibodies provided effective protection against influenza virus, the antibodies did not establish cross-protection between variants of the virus (3, 16). Secretory IgA, which is a dimer of IgA monomers, has multivalent binding sites. It is known that multivalent binding between an antibody and an antigen results in a considerable increase in stability, compared to monovalent binding. Such a phenomenon might be related to the cross-reaction of IgA against B. pertussis and B. parapertussis in our study. Some antigens on the surfaces of B. pertussis and B. parapertussis cells that cross-reacted with secretory IgA from mice infected with B. pertussis and from mice infected with B. parapertussis might be related to reciprocal protection against B. pertussis and B. parapertussis, perhaps via inhibition of the attachment and/or colonization of these bacteria. In a previous study, we detected FHA-specific IgA antibodies in the lungs of mice that had been infected with B. pertussis or B. parapertussis (20), and it has been reported that FHA is important for the attachment of Bordetella to host cells (18). FHA-specific IgA antibodies might be involved in reciprocal protection against B. pertussis and B. parapertussis.

Our data suggest that the induction of mucosal antibodies might be important for the induction of reciprocal protection against B. pertussis and B. parapertussis. The induction of mucosal antibodies by currently available commercial pertussis vaccines, which are administered by injection, is very limited (8, 12, 13, 15). Immunization via a mucosal route, such as intranasally, is effective for the induction of mucosal immunity. Studies of mucosal immunization for the induction of reciprocal protection against B. pertussis and B. parapertussis are under way in our laboratory.

 
* Corresponding author. Mailing address: Department of Microbiology and Biologicals, Daiichi College of Pharmaceutical Sciences, 22-1 Tamagawa-cho, Minami-ku, Fukuoka 815-8511, Japan. Phone: 81-92-541-0161. Fax: 81-92-553-5698. E-mail: min-ind{at}umin.ac.jp.

Editor: J. D. Clements

Top Abstract Introduction Materials and Methods Results Discussion References

 

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Infection and Immunity, February 2003, p. 733-738, Vol. 71, No. 2
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.2.733-738.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

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