Another common way we respond is to mobilize the immune system. Dog And She Lived Happily Ever After poster. Our white blood cells and other cells actively detect and kill foreign germs. The specific antibodies that we gradually build to fight off a specific germ that are infected us will make us less likely to be infected again once the disease has been healed. We all know from experience that there are some diseases such as the flu and the common cold, with them our resistance is only temporary; we can get back to those diseases easily.