Influenza 1234

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Dhaka, Bangladesh

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Influenza 1234

  1. 1. Influenza Presented By: Dr. Md. Salequr Rahman Dep. Of Community Medicine
  2. 2. Influenza • Acute Respiratory Tract infection caused by influenza virus, A, B and C. • Known pandemic caused by A. • Sudden onset of chills, malaise, fever, muscular pain and cough. • Truly an international disease. May occur in pandemics every 10-15 years due to major antigenic changes. In between pandemics, epidemic may occur at intervals of 2-3 years. • At present 3 types of influenza viruses are circulating in the world: A(H1N1), A(H1N2)
  3. 3. Avian influenza: • Large group of different influenza viruses that primarily affect birds. H5N1 virus is a strain of pandemic potential. First infected human in 1997 in Hongkong. • Agent: Type A, type B and type C.
  4. 4. • The influenza virus is unique among the viruses because it is frequently subject to antigenic variation. When there is a sudden complete or major change, it is called a “shift”. • When the antigenic change is gradual over a period of time, it is called a “drift”.
  5. 5. • Reservoir of infection: Animals and birdsswine, horses, dogs, cats, do mestic poultry, wild birds etc. • Source of infection: Case or subclinical case. Usually droplet infection. • Period of infectivity: 1-2 days before and 1-2 days after the onset of symptoms.
  6. 6. Host factors: • Age and sex • Environmental factorsseason, overcrowding
  7. 7. Prevention: • Good ventilation at public buildings, avoidance of crowded places during epidemics, cover the face with handkerchief, to stay at home at first sign of influenza. • Vaccination- effective if administered two weeks before epidemic.
  8. 8. Prevention: • Vaccines recommended for certain groups of people- in industry, for public services, elderly, persons with chronic diseases, HIV infected. • Killed vaccine (immunity lasts for 3-6 months), annual revaccination is necessary/ live attenuated vaccine.

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