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Nasal swabs received between April 25th, 2009 and August 31st, 2009 were included in the study (see figure 1).
Each participant obtaining the self-swab received a round-trip New York City MetroCard (value US$5.00) when the specimen was received.
The total number of swabs received in the laboratory decreased slightly from 60,245 in 2000 to 55,223 in 2004.
Of the 29 swabs received, 18 (62.1%, from seven adults and eleven children) had a corresponding research swab that was positive for a respiratory pathogen.
Interestingly, this value is similar to the PPV of clinical diagnosis by a GP for patients presenting to sentinel sites over the same period in 2009 (31.3% based on 624 viruses from 1993 swabs received).
Where the exact date was unavailable, the date the swab was received at the HPA regional laboratory was used.
It begins when ≥1 nasopharygneal or throat swab specimens received by ProvLab are positive for influenza A and B viruses for two consecutive weeks.
The median time from collection to swab arrival in the laboratory was 2 (interquartile range 2 4) days; however 10.9% of swabs were received more than 7-days after their collection.
In total, 4933 nasal swabs were received in the laboratory.
Stool swabs were received from 517 study participants representing 167 households (Table 1).
All vaginal swabs were received within 24 hours of collection and inoculated onto full plates of chromogenic agar (CHROMagar™Candida, CHROMagar, Paris, France) to isolate, provisionally speciate and semi-quantitatively enumerate Candida species (scant, moderate, or heavy).
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