Introduction About H1N1 Virus Signs and Symptoms Diagnosis Treatment Complications Prevention Specific Groups

Dr. Juan Antonio Mariano Mazzei

Dr. Juan Antonio Mariano Mazzei

President of the Scientific Committee of the 36th Argentine Congress of Respiratory Medicine,
Argentina

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About Influenza A

An acute disease of respiratory system affecting pigs, caused by type A influenza virus (H1N1 subtype) is called as Swine Influenza or H1N1 flu or Swine flu. Now-a-days it is affecting humans too. First isolation of classical H1N1 virus from a pig was done in 1930. World Health Organization (WHO) has declared Flu A as pandemic, since it has already traveled more than 70 countries all over the world. 1

First case in humans was reported in Mexico and the United States in March and April, 2009. On June 11 2009, WHO raised a pandemic alert level to Phase 6 globally (Phase 6 - indicates that a global pandemic is underway) Flu pandemics were reported long back in 1918, 1957 and 1968, with millions of deaths globally. 2

Statistics :
As on August 23rd, there are more than 209,438 laboratory-confirmed cases of H1N1 with at least 2,185 deaths globally as per World Health Organization (WHO) report. South America and parts of Australia and United Kingdom have reported to show continuous decrease in the disease from H1N1. The parts of the world reporting to show continuing increase in disease associated with H1N1 are southern Africa and tropical countries. 3

As per European Centre for Disease Control and Prevention, the total number of confirmed deaths globally reported were 2,594 as on 1st September 2009. There is an increase in number of deaths by 13% in the last week globally compared to the previous week with an increase of 21%. 4

As on 20th August 2009, 47 Member States of WHO European Region reported more than 42,000 confirmed cases of novel H1N1 flu infection. The first laboratory-confirmed case of Belarus was reported on 20th August 2009. Till date, the number of deaths reported was 90 in 9 countries: Belgium, Hungary, France, Israel, Ireland, Spain, Malta, the Netherlands, and the United Kingdom. 5

Usually H1N1 does not infect humans but human infections can happen. It is communicable and can spread from person to person. Since, it is new to humans, there is little or no immunity against it and can cause severe and widespread impact.


Mortality and Morbidity:
Till date, the maximum number of confirmed and probable cases of H1N1 flu was in the age group between 5 and 24-years-old. For now, there are few cases and no deaths reported in the age of more than 64 years old, unlike seasonal flu. 6
Swine Flu Tutorial
Boost YourImmune for Swine Flu
mario-cazzola

Prof. Mario Cazzola

Expert Opinion
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Giovanni Rezza

Prof. Giovanni Rezza

Director
Department of Infectious Diseases, Italian National Institute of Health

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Marc Miravitlles

Marc Miravitlles

Fundacio Clinic. Hospital Clinic
Barcelona, Spain

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