Correspondents say that India's National Anti-Doping Agency (Nada) has been jolted by recent dope scandals and plans to increase the number of samples it collects.

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The standard number of samples taken doubled to 12 over the last decade, he said.

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Again, you would need to fall in the window of number of samples x regions of interest x barcodes x machine capacity.

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According to iResearch, the largest number of malware samples collected by a single Internet security provider in Chinaincreased from approximately 538, 000 in 2006 to over 650, 000, 000 in 2010.

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But the sheer number of those samples can also create headaches when it comes to clearing the legal rights for digital downloads.

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Thomas Watkins, TAP's president at the time, conceded it had provided Lupron samples to a number of doctors who illegally billed Medicare.

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First, he analysed the samples to find their viral load (the number of virus particles per cubic centimetre) and the subtype of virus involved.

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"There have now been a number of attempts which have failed to find the retrovirus in other samples, and this research suggests that in fact XMRV is probably a contamination from mouse DNA, " he said.

BBC: By Helen Briggs