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Infection and Immunity, January 2004, p. 238-246, Vol. 72, No. 1
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.1.238-246.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Single Intranasal Mucosal Mycobacterium bovis BCG Vaccination Confers Improved Protection Compared to Subcutaneous Vaccination against Pulmonary Tuberculosis

Lihao Chen, Jun Wang, Anna Zganiacz, and Zhou Xing*

Infectious Diseases Division, Center for Gene Therapeutics, and Department of Pathology and Molecular Medicine, McMaster University, Hamilton, Ontario, Canada L8N 3Z5

Received 29 August 2003/ Accepted 16 October 2003

Whether the intranasal (i.n.) route of Mycobacterium bovis BCG vaccination provides better protection against pulmonary tuberculosis than subcutaneous (s.c.) vaccination remains an incompletely solved issue. In the present study, we compared both immune responses and protection elicited by single BCG vaccinations via the i.n. or s.c. route in BALB/c mice. While both i.n. and s.c. vaccination triggered comparable levels of primary immune activation in the spleen and draining lymph nodes, i.n. vaccination led to a greater antigen-specific gamma interferon recall response in splenocytes than s.c. vaccination upon secondary respiratory mycobacterial challenge, accompanied by an increased frequency of antigen-specific lymphocytes. There was also a quicker cellular response in the lungs of i.n. vaccinated mice upon mycobacterial challenge. Mice vaccinated i.n. were found to be much better protected, particularly in the lung, than s.c. vaccinated counterparts against pulmonary tuberculosis at both 3 and 6 months postvaccination. These results suggest that the i.n. route of vaccination improves the protective effect of the current BCG vaccine.

* Corresponding author. Mailing address: Rm. 4H19, Health Sciences Centre, Department of Pathology and Molecular Medicine, McMaster University, 1200 Main St. West, Hamilton, Ontario, Canada L8N 3Z5. Phone: (905) 525-9140, ext. 22354. Fax: (905) 522-6750. E-mail: xingz{at}mcmaster.ca.

Editor: S. H. E. Kaufmann

Infection and Immunity, January 2004, p. 238-246, Vol. 72, No. 1
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.1.238-246.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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