Dr. Jonathan H Rosenthal MD

What is Lyme disease and what causes it?Lyme disease is a bacterial infection commonly seen in North America and Europe. It is caused by a bacterium known as Borrelia burgdorferi. The bacteria is transmitted to humans through a tiny black-legged deer tick, which feeds on human blood....

The novel coronavirus, COVID-19, belongs to a large family of viruses that can cause potentially fatal respiratory complications. In humans, this is known to cause respiratory infections that can range from the common cold to more severe symptoms. We initially thought that COVID-19 only affected the...

Cold sores are inflamed fluid-filled blisters, which appear in clusters on and around the mouth or lips. They can be seen when a person has a weakened immune system during fever, cold, or any other disease. Usually, cold sores are not harmful and should heal on their own within two to four weeks...

Acquired Immunodeficiency syndrome, or AIDS, is a disease that develops in the advanced stages of infection by human immunodeficiency virus (HIV). Infection by HIV weakens the immune system of the person by destroying the CD4 cells, the primary infection fighters of the body. A person is said to...

Spirochetal bacteria are relatively harmless within the first days of infection, at worst, it may present with flu-like symptoms – fatigue, headaches, etc. After several weeks, however, the bacteria spread all over the body, affecting crucial body organs and causing severe symptoms. It all starts...

What is toxoplasmosis?Toxoplasmosis is a parasitic infection caused by a parasite called Toxoplasma gondii, which is found in humans and some types of animals. Although this parasite can infect all warm-blooded animals, it tends to only reproduce in the gut of felids, such as domestic cats and...