CDC sees little movement in US flu indicators
US flu activity increased only slightly last week, though markers stayed well below thresholds, the Centers for Disease Control and Prevention (CDC) said today in its weekly update.
The number of respiratory samples that tested positive for flu edged up slightly, from 3.8% to 4.5%, and the percentage of clinic visits for flu remained at the 1.2% seen the previous week.
Among the few positive samples, 93% were influenza A, and the 2009 H1N1 virus was more common than H3N2 in the few samples that were subtyped. Deaths from flu and pneumonia stayed below the seasonal threshold, and no pediatric fatalities from the disease were reported.
Alabama became the first state this season to report regional geographic spread of flu, and four reported local spread: Mississippi, Nevada, South Carolina, and Texas.
Elsewhere, flu in Canada remained low, while in Mexico respiratory virus and flu activity indicators showed slightly increasing trends, according to an Oct 30 update from the Pan American Health Organization (PAHO).
In Europe, all 27 countries that reported last week had only low-intensity flu activity, according to an update today from the European Centre for Disease Prevention and Control (ECDC). Only 1% of sentinel specimens were positive for flu, and so far the ECDC has detected no sign of sustained activity.
Nov 1 CDC weekly flu update
Oct 30 PAHO flu update
Nov 1 ECDC influenza update
Erasmus appeals Dutch court export ruling on H5N1 studies
Researchers from the Erasmus Medical Center in the Netherlands have appealed a Sep 20 Dutch court ruling that requires Erasmus to request and export permit before submitting research on lab-modified H5N1 avian flu viruses for publication, according to Nature's news blog.
Erasmus's Ron Fouchier, PhD, led a study in 2011 involving mammalian-transmissible H5N1 that sparked bioterror concerns, and the US National Science Advisory Board for Biosecurity at first blocked publication of the findings but then allowed it in March 2012.
Last month's ruling said that all future such work requires an export license, which is what Fouchier's group needed to obtain in 2012 before their work could be published in Science. Such controls are meant to prevent the export of technology or information that could be used in chemical or biological weapons.
The Erasmus group filed its appeal just before a 6-week deadline, the blog post said. An Erasmus spokesman said the center's staff may not discuss the issue with the media while the case is under appeal.
Nov 1 Nature blog post
Sep 26 CIDRAP News story "Dutch court affirms limit on publishing H5N1 findings"
Study: Hospital-onset flu cases more likely to be severe
Patients who are infected with the flu in hospitals are more likely to be admitted to the intensive care unit (ICU) or die from the disease compared with those who catch the flu in community settings, CDC researchers reported today in the American Journal of Infection Control.
The authors identified 172 hospital-onset (HO) cases among 6,171 flu-positive hospitalized patients. They found that chronic medical conditions were more common in HO cases (89%) compared with community-onset (CO) cases (78%) (P < .01).
They also found that 42% of HO cases and 17% of CO cases were admitted to the ICU. The median length of stay after flu diagnosis was 7.5 days for HO cases and 3 days for CO cases (P < .01).
Results are based on hospitalizations during the 2010-11 flu season flagged by FluSurv-NET, a population-based network that covers 16 states.
Nov 1 Am J Infect Control abstract