Influenza viruses come in four main types: A, B, C, and D. Influenza A and B primarily cause seasonal flu epidemics in humans and can lead to severe illness. Influenza C typically causes mild illness in humans. Influenza D has not been known to cause human illness. The flu spreads through respiratory droplets when infected people cough, sneeze or talk. Common symptoms include fever, cough, sore throat, and body aches. The best prevention methods are the annual flu vaccine, frequent handwashing, and staying home when sick.

1. INFLUENZA

2. 1. 24. Influenza B • Unlike type influenza A, influenza B is found only in humans. • This virus can only be spread from human to human • Influenza B may cause a less
severe reaction than Influenza A, but occasionally, Influenza B can still be extremely harmful.
2. 5. Influenza c Influenza C viruses are also found in people. People generally do not become very ill from the influenza C viruses. Influenza C do not cause
epidemics. This virus may be spread from person to person through respiratory droplets or by fomites (non-living material) due to itsabilityto surviveon surfacesfor
shortdurations.
3. 6. Influenza D • Influenzavirus D is less common than the other antigenic types, and it is not known to cause any human infections. • Influenza D viruses are known
to infect pigs and cattle; no human infections from this virus have been observed
4. 7. Common signs and symptoms : • Fever over 100.4 F (38 C) • Aching muscles • Chills and sweats • Headache • Dry, persistent cough • Fatigue and weakness •
Nasal congestion • Sore throat In some cases, may also have symptoms such as: • Nausea • Vomiting • Diarrhea Most children recover from the flu within a week.
But they may still feel very tired for as long as 3 to 4 weeks.
5. 8. Causes • These viruses spread when people with flu cough, sneeze or talk, sending droplets with the virus into the air and potentially into the mouths or noses of
people who are nearby. • Touching a surface or object that has flu virus on it and then touching your own mouth, eyes or nose.
6. 9. Prevent• The bestway to preventflu is to have theyearlyfluvaccine. Talk with your healthcare provider if you have questions about how vaccines work and how
well they prevent flu. • Keep yourdistance. It’s easy to pass on germs when you live in close . Avoid close contact with friends, and family members if you have
the flu or a cold. Tell them you're sick and you don't want them to catch what you have. • Stayhome. If you feel sick, don't go to school / work. An adult can
infect other people one day before symptoms show up and up to 5 days after they start. You could spread flu to others before you know you're sick. If you go back
to work or school within 5 days after your symptoms started, chances you’re still contagious. • Coveryourmouthand nose whenyou sneezeor cough . This goes a
long way toward protecting others from your germs. Use a tissue or the inside of your elbow. Afterward, toss the tissue and wash your hands thoroughly to remove
germs. Don't Touch Your Face with unwashed hands; it’s the easiest way for germs to enter your body.
7. 10. Prevent • Eat Healthy and balanced meals to strengthen your immune system. • Exercise boosts your immune system and speeds recovery from illness. •
Washyourhands. This is the best way to prevent the spread of the flu. Alcohol-based hand disinfectants work great, too. Wash or disinfect your hands any
time you touch a sick person might have handled, Computer keyboards, telephones, after use restroom and doorknobs
•

3. People at higher risk of developing flu complications include:
Young children under age 5, and especially those under 12 months
Adults older than age 65
Pregnant women
People with weakened immune systems
People who have chronic illnesses, such as asthma, heart disease, kidney disease, liver disease and diabetes
People who are very obese, with a body mass index (BMI) of 40 or higher
Though the annual influenza vaccine isn't 100 percent effective, it's still your best defense against the flu.

4. Influenza A
That typically infect and transmit among one animal species sometimes can cross over and cause illness in another
species.
influenza A viruses may be transmitted from animals to humans in two main ways:
Directly from birds or from avian influenza A virus-contaminated environments to people.
Through an intermediate host, such as a pig.
Type A flu virus is constantly changing and is generally responsible for the large flu epidemics.
The influenza A virus is spread by people who are already infected.
The most common flu hot spots are those surfaces that an ü infected person has touched ü rooms where he has been
recently, especially areas where he has been sneezing.

5. Influenza A
That typically infect and transmit among one animal species sometimes can cross over and cause illness in another
species.
influenza A viruses may be transmitted from animals to humans in two main ways:
Directly from birds or from avian influenza A virus-contaminated environments to people.
Through an intermediate host, such as a pig.
Type A flu virus is constantly changing and is generally responsible for the large flu epidemics.
The influenza A virus is spread by people who are already infected.
The most common flu hot spots are those surfaces that an ü infected person has touched ü rooms where he has been
recently, especially areas where he has been sneezing.