Dr. John Alexander Viehman M.D.

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...

These are dendritic skin cells and contain Birbeck granules which is an organelle. In almost all the layers of the epidermis, langerhans cells are found. In the stratum spinosum they are the most prominent. Also, in the papillary dermis they occur. They are also found in the mucosa of the vaginal...

What are cold sores?Cold sores or fever blisters are a very common perioral condition caused by the herpes simplex virus (HSV). There are two types of herpes simplex virus. Type 1 usually causes cold sores, although in some cases, the cold sores can also be caused by type 2. It is usually...

Valtrex is the name of the drug that contains valacyclovir. It is prescribed for many infections caused by the herpes virus, which includes cold sores, genital herpes, and shingles. Herpes virus can appear on any part of the body, but most often, it shows in the genitals and mouth. There are two...

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...

People cannot resist themselves from having fun and playing outdoors in the warm spring weather. However, the increased time of being out also increases the risk of encountering with nature’s peskier pests. One such problem is the tick, which is associated with Lyme disease. Tick bites can cause...