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Serum antibody responses by male and female C57B1/6 mice infected with Giardia muris

We compared the levels of serum antibodies in male and female C57BI/6 mice during the primary and after challenge infection with Giardia muris. Male mice began passing cysts in their faeces earlier than females, and were shedding cysts for over 60 days, while females stopped shedding cysts by day 20 after infection. In both males and females there were significant increases in parasite‐specific IgM 10 and 20 days after infection. No differences in parasite‐specific serum IgA were observed until 40 days after infection. Parasite‐specific IgG (whole) levels were elevated on days 20 and 40 in females, while males showed no significant increases. In addition, females had a much stronger IgG2b and IgG3 response than males. After challenge with either cysts or soluble parasite protein only the females had significant increases in specific anti‐parasite IgG2b. Our data show differential ability of males and females to control the infection with G. muris is paralleled by a difference in the anti–parasite serum IgG response of the mice.