The anal swab test is an ancillary test used to check for parasites. This method is based on the fact that female pinworms lay their eggs on the skin around the anus and perineum of the human body, and that the tapeworm gestation nodes rupture during the process of expulsion or active escape from the anus and the eggs adhere to the skin around the anus. This phase examination can be used to determine the corresponding signs of disease.

According to Guangdong Headlines from the Guangzhou Women's and Children's Medical Center, the first pediatric patient discharged from the hospital had 2 negative pharyngeal and anal swabs prior to discharge, but was found to have a positive anal swab after a home visit by CDC staff during home isolation. Currently, the child is in isolation at the Guangzhou Eighth People's Hospital.

Guangzhou Women's and Children's Medical Center Vice President Gong Sitang introduced, according to the consensus reached by Guangdong pediatric experts, the discharge criteria for pediatric patients in Guangdong is more stringent than the national standard, the discharge should reach 2 times pharyngeal swabs, anal swabs negative only, a day apart sampling. The hospital has been testing pediatric patients for discharge according to this standard from the beginning.

Anal swabs are tests on samples of human stool, and a positive anal swab suggests the presence of a viral gene fragment or virus in the patient's stool sample, but this test is not currently included in the national version of the new coronary pneumonia treatment protocol.