(A) A person is infected with the dengue virus when an infected mosquito bites the person’s skin. (B) The dengue virus infects the Langerhans cells, a type of dendritic cell in the skin.

Dengue viral infections can result in a range of symptoms. Some people show no symptoms or just have mild signs of the disease, but others develop severe complications. How does the body respond ...

Excess niacin in the bloodstream activates Langerhans cells in the skin, which regulate immune function. These cells trigger the release of prostaglandins, chemicals that cause blood vessels to ...