The body system that fights against all the external infection caused by microorganisms is known as immune system. Every living being that is free from disease at present is due to this reason. If the person loses the proper immunity functionality then he or she catches sickness soon. Though everyone gets ill at some point in life, there are certain categories of people who are at greater risk.

Pregnant women: Pregnancy increases the risk of catching flu-related issues and is dangerous to both mother and the fetus. Fever is the most common symptom of infection that needs immediate attention due to its adverse effects on the unborn child.

Infants and children: Children are more likely to get sick because their immunity is not as strong as compared to adults. Their complications are generally caused by flu like virus which includes ear infections, dehydration, pneumonia and sinus problems.

Older people: Elder people of age more than 65 years have weak immunity just as children. They generally suffer from long lasting health issues like asthma, heart disease or inflamed brain.

Weakened immunity systems: People suffering from weakened immune systems such as HIV/AIDS or any other are at the highest risk of getting caught under a number of infections and are also incapable of getting cured easily.

Other diseases: People suffering from diseases like diabetes, blood disease, liver disease, kidney disease, lung disease, heart disease and metabolic disease.

Miscellaneous: Flu like H1N1 flu discovered in the year 2009 commonly called Swine Flu resulted deaths of certain adults falling in the age group of twenties and thirties. This was very rare case as flu viruses generally don't influence people of this age group. This suggests that it is a new kind of flu that the people immune system of young age could not recognize the type of virus. But people of older age could resist that infection as these H1N1 virus were similar to those virus discovered in the decade of 1950s and thus old people had already formed antibodies against such viruses.

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