"Unwanted germs" refers to harmful microorganisms or bacteria that we don't want around because they can make us sick or cause disease. Full definition
This leads to certain unwanted germs entering the body. (newkidscenter.com)
The silicone teat is soft, clear and easy to clean, with a clip - on hygienic cap to keep unwanted germs away when not in use. (vitalbaby.com)
Cloth diapers can harbor a host of unwanted germs if not washed properly, according to Dr. Sally S. Robinson, a pediatrician and medical professor at the University of Texas. (care.com)