what causes an abnormal pap
Most abnormal Pap tests are caused by HPV infections. Other types of infection-such as those caused by bacteria, yeast, or protozoa (Trichomonas)-sometimes lead to minor changes on a Pap test called atypical squamous cells.ost abnormal Pap tests are caused by HPV infections. Other types of infection-such as those caused by bacteria, yeast, or protozoa (Trichomonas)-sometimes lead to minor changes on a Pap test called atypical squamous cells.