Cytomegalovirus (CMV) can affect all people, but those with compromised immune systems are most susceptible. The virus spreads through bodily fluids, like saliva, blood, and urine. Though the virus can stay in the body for a long time without any symptoms, a person can become symptomatic when they’re under stress or their immune system becomes weak. Symptoms can include fever, muscle aches, and tiredness. Severe cases of CMV may result in pneumonia and encephalitis, though these cases are rare.
Warts from the human papillomavirus (HPV) on the mouth are relatively rare. At the same time, it is possible to transmit the virus if there is an open sore on the mouth, but you’d have to spend a lot of time kissing.
Many coronaviruses, from the mild common cold to Severe Acute Respiratory Syndrome (SARS), and even SARS-CoV-2 (COVID-19), can be transmitted through a kiss. These viruses are mostly respiratory and can quickly spread from person to person. Because these viruses are present in respiratory droplets and saliva, coronaviruses transmit quickly through kissing.Related: A Doctor Explains How to Never Catch COVID-19