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CURRENT SITUATION OF INFLUENZA IN THE UNITED STATES OF AMERICA
A) Current Situation
1) Flu’s Activity:
According to the final report of the “Flu View” for the 2009 – 2010 influenza season(may 16th-22th, 2010), the activity of the flu in the USA has decreased again since the second week of May and now it’s the same as what is normally observed during the summer time at the USA. Just a small amount of cases of the influenza virus had been reported (most of them were attributed to the 2009 H1N1 virus). As we know, the flu is an unpredictable disease but, according with the current tendencies, it is probable that some sporadic cases of this disease, caused by the 2009 H1N1 virus or by the seasonal flu virus, may appear during the summer time.
2) About the vaccination:
The CDC recommends the vaccination against the influenza as the most important measurement for the protection against the flu. However, the 2010-11 seasonal vaccine is not still available until September or later. Given that some sporadic cases of the 2009 H1N1 had been detected after the regular influenza season (October – May) and also in others parts of the world (especially in the South Hemisphere in where the flu season is beginning), the CDC are still fomenting the use of vaccination with the available doses of the monovalent vaccine against the 2009 H1N1 flu until the vaccine against the seasonal influenza will be available. To be vaccinated against the 2009 H1N1 flu, in this moment, can result particularly important for:
1.- The 6 months to 8 years old children who had not yet received the vaccine against the 2009 H1N1 flu. The fact of that these children receive a dose against the 2009 h1N1 flu during the summer time means that they just going to need one dose of the seasonal flu when this one will be available.
2.- The persons who travel to areas in where the 2009 H1N1 virus is still in circulation and
3.- The persons who have a major risk to suffer complications related with the flu but who don’t have yet received the vaccine against the 2009 H1N1 virus. These include the persons with pulmonary diseases like asthma or chronicle obstructive pulmonary disease (COPD), diabetes, heart or neurological diseases and the pregnant women.
B) Mortality
The proportion of death attributed to pneumonia and influenza (P&I) based on the 122 Cities Report is at about what is normally seen during the summer time. Three pediatric deaths associated with 2009 h1N1 flu were reported this week. Since April 2009, CDC has received reports of 341 flu laboratory-confirmed pediatric deaths: 285 due to 2009 h1N1, 53 pediatric deaths that were laboratory confirmed as influenza A, but the flu virus subtype was not determined, and 3 pediatric deaths that were associated with seasonal influenza viruses. During the regular 2009 – 2010 influenza season (October to May), 276 pediatric deaths were reported to CDC. All but one was 2009 H1N1-related. (Laboratory-confirmed deaths are thought to represent an undercount of the actual number).
C) Conclusion
The majority of the influenza viruses identified so far continues to be 2009 H1N1 influenza a viruses. These viruses remain similar to the virus chosen for the 2009 H1N1 vaccine and remain susceptible to the antiviral drugs oseltamivir and zanamivir with rare exception.