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County of Montgomery highlighted in red.
According to the US Centers for Disease Control and Prevention website, seasonal influenza's populations at greatest risk of severe disease usually include the very young (under 5-years) and older adults (>65-years), pregnant women and indigenous populations, and those with a range of pre-existing medical conditions.
4/8 cases died and none of the fatal cases were vaccinated against influenza (?survivors were vaccinated). Kidney issues have also been reported according to a video report at the Houston Chronicle.
1/4 surviving case has tested positive for influenza A(H1N1)pdm09 virus, which is circulating locally as the annual flu season is well engaged in the region. 2 other survivors have tested NEG for all influenza viruses and have been sent on to the CDC. Test results are outstanding on the other survivor.
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2013-14 Influenza season data from FluView, CDC at
Of those 221 antigenically subtyped by the CDC,
184 are H1N1 2009.
It would be interesting to know what testing has been employed for influenza and what other respiratory viruses and bacteria have been tested for and excluded because, despite some enthusiastic but highly misleading and inflammatory guesswork, there are not yet enough data to identify an infectious aetiology for this pneumonia cluster. I'm sure in a busy environment like this, work is progressing on many levels to resolve the mystery. Since at least 2 of the 8 patients have tested negative for influenza viruses, it is premature to extrapolate from the 1 positive case that H1N1 is the cause of all cases; it may be but those results are not yet in.
- CIDRAP story. http://www.cidrap.umn.edu/news-perspective/2013/12/texas-health-officials-probe-severe-flu-illness-cluster
- Montgomery County Public Health on Facebook page. https://www.facebook.com/mctxpublichealth
- FluTrackers page. http://www.flutrackers.com/forum/showthread.php?t=214964
- Fox Houston. http://www.myfoxhouston.com/story/24257668/the-return-of-h1n1