So far, NAMRU-3, the official lab were the samples from the suspected cluster in Pakistan were sent, has only been able to confirm one case.
Experts still believe that limited human to human transmission between family members probably occurred and ended in November. Failure to get positives on the rest of the samples from the cluster could be due to either degradation of samples and/or the high sensitivity of the tests used in Pakistan, which may produce false positives.
More from WHO:
http://www.who.int/csr/don/2007_12_27/en/index.html
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