Schistosomes are blood flukes, or flatworms, that infect
people through the skin during the parasite's waterborne larval stage.
Zoonotic pathogens that infect
domestic animals and wildlife hosts are more likely to emerge (5).
Typically an avian flu virus first infects
pigs, then humans.
A virus attached to e-mail messages can infect
an entire enterprise in a matter of minutes.
In at least one animal that SIV naturally infects
, the sooty mangabey, it causes a very high viral load with little immune response, but does not hurt the animal.
(Reuters) - The outbreak of the Nimda computer worm, which has spread rapidly across the Internet, appeared to have peaked on Wednesday for the powerful server machines that drive the Web, but the number of infected
PCs may never be known, computer security experts said.
cows; related diseases attack sheep, humans
Other elderly people, especially those with weak immune systems, become newly infected
Only a limited number of SaV studies have been conducted, although most studies have shown that SaV infections are more frequent in young children than in adults and that nearly all children are infected
by 5 years of age.
The enzyme, called lysin, prevented the death of most mice that the researchers had infected
with a bacterial relative of B.
Essential for controlling intracellular pathogens, cell-mediated immunity involves lymphocyte recognition of cell-associated foreign antigens, followed by destruction of the infected
In West Africa, for example, Lassa virus infects
100,000 to 300,000 people per year, killing more than 5,000 annually.
When roused from its quiescent state, the virus can trigger the cells it infects
to grow wildly, producing several kinds of cancer (SN: 2/18/95, p.
Some scientists theorize that this bird-flu strain may have a lower reproduction temperature, which might explain how it infects
humans as well as birds.
CTFV can be isolated from blood because it is present in circulating erythrocytes for as long as 4 months (28), and it infects
the hematopoietic progenitor cells and remains sheltered in erythrocytes after maturation.