nee Peter Medaeria, viruses aren’ttion t and  introduce to a suitable and t into busyness—into life. About five types of virus are kno us o t are most invidious to he source of AIDS.

    Viruses prosper by ic material of a living cell and using it to producemore virus. tical manner, t out in searcoinvade. Not being living organisms to be very simple. Many,including en genes or feeria require severaltiny, mucoo small to be seen ional microscope.

    It  until 1943 and tion of tron microscope t science got its first lookat t tietury alone killed anestimated 300 million people.

    ty to burst upon tartlingform and to vaniso come dorange sleeping sickness, ims o sleep and not  great difficulty to take food or go to tory, and ionssensibly—tic.

    tted to rest, t once back intodeepest slumber and remain in t state for as long as t. Some  on in t notted in a state of profound apatinct volcanoes,” intor. In ten years tly  a didn’t get mucing attention because in time an even  in ory—s across the world.

    It is sometimes called t Simes t Spanis in eit y-one million people infour years; ss first four mont 80 percent of Americancasualties in t orld ar came not from enemy fire, but from flu. In some units tality rate was as .

    S some mutated into sometims suffered only mild symptoms, but t became gravely ill and often died.

    Some succumbed hers held on for a few days.

    In ted States, t deaton in late August1918, but to all parts of try. Scertainments