A major shift in genetic material, likely to occur when two viral types infect
the same host, is
If genetically distinct cotton rat populations living outside the EVEV-enzootic region do not sustain the magnitude or duration of viremia titers needed to infect
sufficient numbers of vectors, they could be incapable of maintaining virus circulation.
After a brief bout of replication, the new viruses are ready to infect
nearby B cells and spread throughout the body.
Several factors affect how rapidly a worm spreads: how efficiently it discovers new targets, how many targets are available, and how fast it infects
tuberculosis' ability to infect
and persist but also to use that new knowledge for developing better drugs and vaccines.
Since the anthrax bacterium is dangerous to handle, Walter's group has begun characterizing phages that infect
a harmless relative, Bacillus cereus.
This is the first time that biologists have shown that a virus takes advantage of one type of immune cell to infect
another, says Yvette van Kooyk of the University Medical Center St.
Researchers recently found that HIV and a member of the poxvirus family, which includes variola, infect
cells by using some of the same cell-surface proteins.
This chemical seems to suppress other immune cells from making several other compounds that stymie HIV's ability to infect