In addition to measles, influenza and gastroenteritis are on the rise again this winter, according to the Direction de santé publique de la Montérégie. Dr. Julia Pinheiro Carvalho provides an update on these seasonal viruses. 

For those interested, influenza is one of the flu viruses. The most widespread, at the start of 2025, is type A, according to the health professional. “It can cause fever, runny nose, fatigue and breathing difficulties, which in some cases can lead to pneumonia in more vulnerable people. At the moment, we are at the beginning of the peak of contamination. The number of cases should increase over the next few weeks,” she begins. 

Ms. Pinheiro Carvalho urges seniors over 75 to get vaccinated to prevent influenza. “It's good protection and people can get it free of charge. The clientele most at risk are babies aged six months and over, and people with chronic illnesses, heart conditions or lung problems. The vaccine has proven its effectiveness, since the number of people hospitalized for influenza drops by half when they receive the vaccine,” she adds. 

Symptoms of influenza can be felt from 5 days to two weeks.“People are contagious during this period, and it's advisable to wear a mask if you leave the house, or to keep children at home rather than sending them to daycare or school. Frequent hand washing can also be a good way of preventing the spread of the virus, as can the reflex of coughing into your elbow when necessary.”

Two seasonal viruses 

Like gastroenteritis, influenza is a seasonal virus. “They gain in popularity during the winter season, since we're indoors more often and have more contact. Of course, the holiday season, when we're with our families more, is a good time to get infected,” she asserts. 

Gastroenteritis is just as seasonal, but emanates from a different virus. “It works more quickly to attack the body. Usually, people suffering from it vomit and have diarrhea for 24 to 72 hours maximum. Contamination can be significant, as droplets can be thrown far and wide during vomiting. It's essential for sufferers to stay well hydrated. “

You can sometimes avoid being contaminated by gastroenteritis if you disinfect your hands frequently, and if the bathroom used by the patient is disinfected after each visit.  “As with measles or influenza, it's important to wear a mask when leaving the house to avoid contaminating people who cross your path,” she concludes.