How does the World Health Organization (WHO) monitor influenza globally?

The flu is a contagious respiratory illness caused by influenza viruses. The flu can cause mild to severe illness. If left untreated, it could lead to ... Feb 10, 2025 ... What causes body aches? ... Viral infections, such as the flu, COVID-19 or common cold, and some bacterial infections can cause widespread body ... Bird flu, or avian flu, is an infectious type of influenza that spreads among birds. ... But there are 4 strains that have caused concern in recent years: H5N1 ... Aug 10, 2023 ... A life-threatening blood clotting disorder can be caused by an infection with adenovirus, one of the most common respiratory viruses in pediatric and adult ... A headache is a pounding feeling in your head or neck that is triggered by pain-sensitive nerves. What are the symptoms of a cold and flu headache? What causes ... Jun 7, 2024 ... Influenza is a common cause of pneumonia, especially among younger children, the elderly, pregnant women, or those with certain chronic health conditions. Seasonal influenza, commonly known as the "flu," is a contagious respiratory illness caused by influenza viruses, leading to annual outbreaks in the fall and ... Feb 12, 2025 ... Generally, influenza viruses can infect some wild species without causing signs of disease, but new strains can emerge that cause illness with ... Symptoms of the common cold caused by the rhinovirus include sore throat, runny nose, coughing, sneezing, watery eyes, headaches, and body aches. Jan 4, 2023 ... Seasonal influenza (flu) season is here. There are four types of influenza viruses: A, B, C, and D. Influenza A and B viruses cause seasonal ...