A false neg test!: Sometimes, the test kit is inaccurate, despite a "duck looking, squawking and smelling like a duck". Testing for the flu using "rapid" methods, can be notoriously inaccurate- 40% or more samples from pts that actually have flu, can have "negative" test results. Otherwise, depending on your situation, other viral infections such as HIV, are possible.
Answered 1/9/2015
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