A certain type of asthma may make people more susceptible to flu and also lead to dangerous flu mutations, according to new studies in animals.

Even if we start to see a decrease in COVID cases, a study of the 1918 influenza pandemic suggests a spike could occur in late 2021 or early 2022.

Americans with excess weight and obesity have been hit hard by COVID-19. Now there is reason to believe they may not get the same protection from the vaccines.

Children who receive a seasonal flu shot are less likely to suffer symptoms from a COVID-19 infection, according to a new study.

You need a new shot every year because current flu vaccines provide limited and temporary protection. But researchers' new strategy could mean a one-and-done influenza vaccine is on the way.

COVID-19 is much deadlier and causes more health problem for patients than the seasonal flu does, according to a deep dive into federal medical data.

New research suggests a link between cadmium exposure and deaths from influenza, pneumonia, and possibly COVID-19.

Going out in the cold won't necessarily lead to you getting a cold. But cold weather in general is more hospitable to viruses, so it's wise to take steps to keep your immune system strong.

Many people object to the added ingredients in vaccines. But pharmacists explain why those fears are unwarranted.