Chickenpox is an illness caused by the varicella zoster virus (VZV), which is a member of the herpesvirus family.The illness lasts between 5 and 10 days causing an itchy, blister-like rash, fever, headache, fatigue, and loss of appetite.hickenpox is an illness caused by the varicella zoster virus (VZV), which is a member of the herpesvirus family.
Mexicoâs ten largest cities (2009 population) are: Mexico City 19,982,000 (Metropolitan Area) Guadalajara 4,365,000. Monterrey 3,986,000. Puebla 2,647,000.
Mexico City has a long, rich history and is know for being one of the largest financial centers in the continent and the largest Spanish-speaking city in the world. As of 2016, the population of the city is estimated to be 8.9 million. The estimated population of 8,918,653 in 2016 is up from 8.851 million in 2010. The metropolitan area, however, is much larger with a population of 21.2 million people, making Mexico City the most populous metropolitan area in the Western Hemisphere.