What is influenza (also called flu)?
The flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat and sometimes the lungs. It can cause mild to severe illness, and at times can lead to death. The best way to prevent the flu is by getting a flu vaccine each year.
Signs and symptoms of flu
People who have the flu often feel some or all of these signs and symptoms that usually start suddenly, not gradually: fever (it’s important to note that not everyone with flu will have a fever) or feeling feverish/chills; cough; sore throat; runny or stuffy nose; muscle or body aches; headaches; fatigue (very tired) and some people may have vomiting and diarrhoea, though this is more common in young children than in adults.
How flu spreads
Most experts believe that flu viruses spread mainly by tiny droplets made when people with flu cough, sneeze or talk. These droplets can land in the mouths or noses of people who are nearby. Less often, a person might also get flu by touching a surface or object that has flu virus on it and then touching their own mouth, nose, or possibly their eyes.
Period of contagiousness
You may be able to pass on the flu to someone else before you know you are sick, as well as while you are sick. Although people with the flu are most contagious in the first 3-4 days after their illness begins, some otherwise healthy adults may be able to infect others one day before symptoms develop and up to 5-7 days after becoming sick. Some people, especially young children and people with weakened immune systems, might be able to infect others with flu viruses for an even longer time.
Onset of symptoms
The time from when a person is exposed to the flu virus and infected to when symptoms begin is about 1-4 days, with an average of about two days.
Complications of flu
Complications of flu can include bacterial pneumonia, ear infections, sinus infections, and worsening of chronic medical conditions, such as congestive heart failure, asthma, or diabetes.
People at high risk from flu
Anyone can get the flu (even healthy people), and serious problems related to the flu can happen at any age, but some people are at high risk of developing serious flu-related complications if they get sick. This includes people over the age of 65, people of any age with certain chronic medical conditions (such as asthma, diabetes, or heart disease), pregnant women, and young children.
Preventing seasonal flu
The first and most important step in preventing flu is to get a flu vaccination each year. CDC (Centres for Disease Control and Prevention) also recommends everyday preventive actions (like staying away from people who are sick, covering coughs and sneezes, and frequent handwashing) to help slow the spread of germs that cause respiratory (nose, throat, and lungs) illnesses, like flu.
It is very difficult to distinguish the flu from other viral or bacterial causes of respiratory illnesses on the basis of symptoms alone. There are tests available to diagnose flu.
There are prescription medications called “antiviral drugs” that can be used to treat flu illness. Antiviral drugs are prescription medicines (pills, liquid, an inhaled powder, or an intravenous solution) that fight against the flu virus in your body. Antiviral drugs are not sold over the counter. You can only get them if you have a prescription from your doctor or healthcare provider. Antiviral drugs are different from antibiotics, which fight against bacterial infections.
Article supplied by the Hospital Particular do Algarve Group, with hospitals in Alvor and Gambelas (Faro)