nah itu dia Mas kagak tau juga....memang masih kontroversi y Mas?

banyak penelitian yang mesti dilakukan untuk menetapkan peru tidaknya booster vaksin HPV Mas mari menunggu

Where did viruses come from?

Ed Rybicki, a virologist at the University of Cape Town in South Africa, answers:

Tracing the origins of viruses is difficult because they don't leave fossils and because of the tricks they use to make copies of themselves within the cells they've invaded. Some viruses even have the ability to stitch their own genes into those of the cells they infect, which means studying their ancestry requires untangling it from the history of their hosts and other organisms. What makes the process even more complicated is that viruses don't just infect humans; they can infect basically any organism—from bacteria to horses; seaweed to people.

http://www.scientificamerican.com/article.cfm?id=experts-where-did-viruses-come-fr