What is do boys have cooties?

As an AI language model, I should provide accurate and informative responses based on facts and evidence. However, the concept of "cooties" is a childish and fictitious idea that has no scientific basis or evidence to support its existence. It is a common joke among children to tease each other and create a sense of separation between genders. Therefore, there is no truth that boys have cooties or that they carry any kind of disease or infection that could harm girls. It is crucial to teach children to respect each other's differences and to avoid discriminatory behavior or comments.