Botnets start when a virus infects a computer, either through spam or an infected web page.
For example, hives are sometimes blamed on a certain food when a virus was the actual cause, he added.
When a virus infects a computer with a throttle, a huge backlog of requests develops within a few seconds.
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That experiment was based on the long-held notion that a pandemic strain is more likely to emerge when a flu virus mixes its genes with another virus in an animal host, such as a pig.
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When a new flu virus pops up, "we immediately begin to think about the process of making a vaccine, " Bresee said.
When a person gets infected with a virus, the body typically mounts an immune response to it.
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When infected by a virus, the immune system typically targets those chains of dsRNA in an attempt to prevent replication.
Either way, when you are sick with a virus whether it is flu or norovirus, you should stay home, isolated yourself from others, wash your hands frequently, drink plenty of fluids, and watch our coverage of the outbreak on TV.
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But when the virus produces protein, a troublesome mutation results in a change to the amino acid sequence that makes up the protein.
When the virus was injected into a region of the hearts of seven guinea pigs, five later had heartbeats which originated from their new pacemaker.
The reason for this is when their immune systems finally encounter a virus later in life, the cells meant to fight the infection start dividing really fast.
This is done in the hope that the protein will keep its shape better, and the immune system will thus be able to produce antibodies that recognise the real thing when they encounter it on a wild virus.
Researchers claimed a breakthrough in preventing the spread of HIV , the virus that causes AIDS, when the results of a study using an experimental vaccine on 16, 000 volunteers in Thailand showed the risk of infection had been cut by 31%.
Scientists foresee a day when they can churn out virus-size computers, cancer-munching robots swimming through arteries and desktop factories assembling watches out of dust.
When the virus reached the United States a few months later 40m doses of vaccine were ready to limit its damage.
He continued riding point-to-point for two years under the guidance of Jackie Wing, but his future looked bleak when the stables were struck down by a virus.
When it reaches a new victim, the virus searches for addresses to despatch itself to and also picks a random e-mail address for the 'from' line to cover its tracks.
That theory received a big boost when tests on the British virus showed it to be virtually identical to the strain that had caused the Hungarian outbreak.
This would change when the virus crossed paths with cells containing a very specific DNA sequence, a sequence that would act as a molecular key to unlock secondary functions that were not so benign.
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It's the tale of how all four of them survived when the H1N1 virus came knocking on the door a couple weeks before Halloween.
It is the price Mexico is paying for taking a high profile stand against a virus which it did not understand when it first appeared.
Mr Quammen traces the various strains of HIV back to the beginning of the 20th century, when the virus is likely to have moved from a chimpanzee into a human.
When any member of EVAC is hit by a novel virus, either a completely new one or a vicious variant of an old one, they pass on a warning which is distributed to all members of the network.
When a little bit of that signature changes, does the anti-virus scan pick it up or not?
In 1957, when flu swept through Hong Kong, Mr Hilleman identified the virus as a new form to which people had no natural immunity and passed on his findings to vaccine-makers.
When levels of the virus began to rise in October 2012, it saw a "cocktail of different strains" circulating.
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However, when pregnant females are infected, the virus can damage the foetus, leading to a range of deformities at birth.
The virus seems to have done little damage because users get a warning when it tries to delete important files and asks them to approve the action.
Because swine flu is a new virus, no one in the world had immunity to it when it came on the scene earlier this year, so it is spreading quickly.
It stands to reason that the active virus, which when it is infecting plants will be present in both a naked and encapsulated form, should be a greater risk (if at all) than a fragment of one of its genes.
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