Getting the flu can be more worse than a cold, and for the first time scientists are studying how flu gets passed around, particularly those who are spreading the viral disease the most, the answer... kids and of course children in the school environment!
Here Dr Ghosh provides a brief insight into how the flu virus is contagious and can be passed on between people very easily.
Watch the show on BBC iPlayer until Thursday 14th 2013.
More About Symptoms Of Flu:
You can catch flu - short for influenza - all year round, but it is especially common in winter, which is why it is also known as 'seasonal flu'.
Flu causes a sudden high temperature, headache and general aches and pains, tiredness and sore throat.
You can also lose your appetite, feel nauseous and have a cough.
Flu symptoms can make you feel so exhausted and unwell that you have to stay in bed and rest until you feel better.
When to see a doctor
If you are otherwise fit and healthy, there is usually no need to see a doctor if you have flu-like symptoms. The best remedy is to rest at home, keep warm and drink plenty of water to avoid dehydration. You can take paracetamol or ibuprofen, to lower a high temperature and relieve aches.
You should see a doctor if you have flu-like symptoms and you:
are 65 or over
have a long-term medical condition such as diabetes, heart disease, lung disease, kidney or neurological disease
have a weakened immune system
This is because flu can be more serious for you, and your doctor may want to prescribe antiviral medication
Further information can be found on the NHS website information about Flu: