Varicella (Chickenpox) Cases, Deaths, and Vaccination Rates
Varicella (chickenpox), according to the CDC, is "a very contagious disease caused by the varicella-zoster virus (VZV). It causes a blister-like rash, itching, tiredness, and fever."
In 1767, English doctor William Heberden first distinguished chickenpox (varicella) from smallpox (variola major and variola minor). In 1892, Hungarian pediatrics professor James Bokay wrote of the connection between chickenpox and later contraction of shingles; his theory was be proven correct in 1925 by K. Kundratitz, MD. Thomas Weller, MD, first isolated the varicella virus in 1953. In 1974, Michiaki Takahashi, MD, attenutated (keeping the virus live but weakening it so that it is essentially harmless) the varicella virus, creating a vaccination. A version of that vaccine, Varivax, was licensed and used in the United States in 1995 and, as of June 25, 2014, remains the only varicella vaccination used in the United States.