What is a humans slowest defence against germs?

The human body's slowest defense against germs is the adaptive immune system. This system takes time to respond, typically days to weeks, as it involves the activation of specific lymphocytes, such as T cells and B cells, that recognize and target particular pathogens. Once activated, these cells can provide long-lasting immunity through memory cells. This slower response is crucial for effectively combating infections that the body has not encountered before.