Gender stereotypes suggest girls form more cliques than boys, but a new study on infectious diseases contradicts this, suggesting that boys are more likely to form tight-knit friendship groups and mix with the same 6 friends over a period of 6 months, whereas girls' friendships were more variable.

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Gender stereotypes suggest girls form more cliques than boys, but a new study on infectious diseases contradicts this, suggesting that boys are more likely to form tight-knit friendship groups and mix with the same 6 friends over a period of 6 months, whereas girls' friendships were more variable.