In one test, the researchers
infected 10 mice with larval Schistosoma mansoni and, starting a week later, injected each animal daily for 5 weeks with either K11777 or an inert solution.
In 1983, a major epidemic occurred during which several monkeys died, 1,555 humans were
infected, and 150 humans died.
Type B influenza
infects only humans, primarily children, and generally causes milder disease than type A.
They
infect macro utilities within Microsoft Word and Excel, and can
infect hundreds of files if undeterred.
This does not happen with most viruses, because they do not
infect the CD4 cell.
"Since late yesterday the number of
infected Web servers has come down," said Joe Hartmann, director of North American anti-virus research for Trend Micro, a Cupertino, California-based computer security company.
Infects only "cloven-hoofed" animals (cattle, sheep, goats, pigs, etc.)
Because most
infected people expel relatively few bacilli, transmission of TB usually occurs only after prolonged exposure to someone with active TB.
Bacteriophages, or phages,
infect bacteria in order to reproduce inside.
Pregnant women in malaria-endemic regions are at risk of becoming
infected with Plasmodium falciparum, 1 of 4 parasites that cause malaria in humans (7).
In the last three decades more than 50 lethal viruses (microscopic particles that cause infection) once found only in animals have
infected humans.
There's been a controversy for many years about whether the virus
infects healthy epithelial cells or just cancerous and precancerous cells.