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We found previously that mice inoculated orally with simian rotavirus strain RRV developed virus-specific memory B cell responses 16 weeks after immunization that were greater than those found 6 weeks after immunization. Memory B cell responses were defined as the quantity of virus-specific IgA detected in small intestinal lamina propria (LP) fragment cultures of immunized mice at various intervals after challenge. Enhanced memory B cell responses correlated with enhanced protection against shedding. In order to understand better the delayed onset of rotavirus-specific memory B cell responses, a method was developed to determine the frequencies of rotavirus-specific memory B cells in gut-associated lymphoid tissues (GALT). We found that protection against rotavirus challenge was determined by the frequency of rotavirus-specific memory B cells in GALT LP.
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