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1Department of Clinical Microbiology, Christian Medical College & Hospital, Vellore 632004, Tamil Nadu, India 2Department of Microbiology, Pushpagiri Medical College, Tiruvalla 689 101, Kerala, India
Correspondence K. N. Brahmadathan knb1948{at}hotmail.com
Received November 28, 2003
Accepted November 8, 2004
Dynamics of anti-M antibody response following intranasal infection with group A Streptococcus (GAS) M-18 were investigated in a Swiss albino mouse model. Mice arranged in three groups were inoculated intranasally with 2.0 x 107 c.f.u. ml1 of GAS M-18 on 1, 2 alternate and 3 alternate days. Plasma collected from the retro-orbital plexus was tested for antibodies by an in-house indirect ELISA. The antibody titres of the plasma samples varied from 1 : 8 to 1 : 1024 in the 1 day dose, from 1 : 4 to 1 : 256 in the 2 day dose and from 1 : 4 to 1 : 128 in the 3 day dose. Peak titres were seen on day 42 or 56 and in all cases the titres had declined by day 84. Swiss albino mouse can thus serve as a useful animal model to study different aspects of type-specific anti-M immune responses against GAS disease when designing candidate streptococcal vaccines.
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