Until researchers can determine what animal is the natural host of the virus, and how MERS spreads from the host to humans, each new outbreak is dangerous and mysterious.
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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Some chimpanzees host the SIV virus which is regarded as being similar to HIV.
Scientists are working to figure out which species could now be playing host to the virus, and one possibility is pigs.
This third way is to insert their genes into another, more conventional virus instead of a traditional animal host.
When jumping into another virus, they may bring those host genes with them.
And, as a bonus, it is the protein that locks on to the surface of a host cell before the virus enters it.
Once the virus has established itself on a host computer, it quickly destroys all music and image files and disables the e-mail system, causing irreparable damage at some companies.
The HIV retrovirus, in particular, is a single-stranded RNA virus that duplicates itself in a host cell by converting its genetic code into double-stranded DNA that is then inserted into the host cell.
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The host cell has no idea that its genetic code (which it generally needs to produce new, healthy cells) has been hijacked, for a long time at least, until the code has been copied and read to reproduce the virus many, many times by the host cell.
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But it is not simply a matter of an animal virus suddenly finding humans to be a congenial host, and flourishing as a result.
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The T-cells from those who have been exposed automatically recognise the disease in their new host and kill PTLD cells loaded with the virus.
The virus, first detected nearly two weeks ago by the military's Host-Based Security System, has not prevented pilots at Creech Air Force Base in Nevada from flying their missions overseas.
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