Hundreds of people gathered Sunday to protest a new flu vaccine mandate for students in Massachusetts enacted as school districts prepare to reopen during the pandemic.

Hundreds gathered outside of the State House in Boston to protest the mandatory flu vaccine requirement for all students in Massachusetts

Countries in the Southern Hemisphere are reporting fewer cases of the flu and it may be because of precautions taken amid COVID-19.

Health officials are concerned about a "twindemic," a combination of influenza and COVID-19 outbreaks, this year.

At least 16,000 people have died and 280,000 have been hospitalized due to the flu, according to preliminary estimates from the CDC.

The Centers for Disease Control and Prevention reported Thursday that the overall effectiveness of the shot in the current flu season is 45 percent.

Authorities say a college student was found dead in his home of the flu after a garbled 911 call left rescuers with no means of locating him

Parents are being warned that this flu season has been the worst one for children in a decade.

Chief health correspondent Dr. Jen Ashton shares tips and the latest information.

Jade, a 4-year-old girl from Iowa, lost her vision after getting the flu.

After unexpected complications from the virus, Amanda Phillips has shared the new warning after her daughter Jade, who did not get a flu shot, was diagnosed with a rare disease.

National levels of flu-like illness remain high and have been elevated for nine weeks, according to a report from the Centers for Disease Control and Prevention.

Flu deaths are up more than 65% so far in 2020, with the Centers for Disease Control and Prevention reporting that 4,800 people had died and 87,000 people had been hospitalized.

Cases of the dangerous B strain of the virus are are appearing earlier than normal, and it’s the highest number of deaths since 2013.

More than half the country is facing high levels of flu-like illnesses, which is up 33% from the previous week, according to the CDC’s latest flu report.

CDC recommending the flu vaccine for everyone 6 months or older.

Xofluza is a single dose medication that prevents the flu with an 86% success rate, but is it worth the cost?

The winter flu season in the United States is off to its earliest start in more than 15 years

It doesn’t take much for the influenza virus to spread, which the New England Patriots saw firsthand after eight players missed practice this week with flu-like symptoms.

Nine players, including five starters, were sent home from Wednesday’s practice.

Before peak season, 30 states are reporting a higher number of flu cases than last year.

There has been widespread flu activity across several states as well as Puerto Rico at a higher number of reported flu cases than at the same point in time last year.

There's a wide discrepancy in what insurers pay for the same flu shot.

Authorities say 10 people at an Oklahoma care facility for people with intellectual disabilities were hospitalized after they were injected with what's believed to be insulin rather than flu shots

Dr. Jennifer Ashton talks about a possible shortage of some flu vaccinations this year and when the best time is to get the vaccine.

ABC News' Dr. Jennifer Ashton shares what women need to know about a new CDC report.

A new report shows that nearly half of U.S. newborns and new moms are at risk of the flu, which could lead to serious complications.

ABC News’ Dr. Jennifer Ashton shares tips on how to protect yourself and your family after the flu-related death of a woman in New Mexico.

The National Foundation for Infectious Diseases stressed the importance of the flu shot this season.

With flu season starting, ABC News’ Dr. Jennifer Ashton shares the latest recommendations from the CDC and National Foundation for Infectious Disease on how to protect yourself.

The CDC recommends that everyone get the flu vaccine before the end of October.

President Donald Trump signed an executive order Thursday aimed at developing better flu vaccines to defend Americans against influenza.

The start of flu season is less than a month away, but doctors in central Florida are already seeing a huge increase in the amount of cases.

ABC News chief medical correspondent Dr. Jennifer Ashton weighs in on this year's strain of influenza and how to prepare this flu season.

Dr. Jennifer Ashton discusses what to expect and provides tips on how to prevent getting sick.

The CDC is warning this flu season is now the longest in a decade, with 21 weeks of elevated flu activity in the US.

You can still get vaccinated.

Plus, Brie Larson surprises fans seeing "Captain Marvel" at a New Jersey movie theater and a new way to eat pineapple is taking the internet by storm.

ABC News chief medical correspondent Dr. Jennifer Ashton reports on the details of the strain and what you and your family can do to protect yourselves.

Up to 15 patients with the flu came to Northwest community hospital's emergency room per week, Dr. Doane of the hospital told ABC News affiliate WLS.

Martin Campbell died hours after being diagnosed and released from the hospital.

The flu vaccine is doing a relatively good job this season, protecting about half the people who got it, U.S. health officials said Thursday.

That figure is said to be within an expected range.

ABC News' Paula Faris shares apps that can help you track your symptoms and find the cheapest options for medications.

Flu season is officially upon us, here are some ways to stay healthy!

Up to 7 million people have caught the flu this season, according to the CDC.

The worst of the 2018-2019 flu season may be yet to come.

Doctors suggest people get a flu shot if they have not already.

There are 19 states with high levels of flu activity and there have been 13 pediatric flu-related deaths this season.

The drug reduces the duration of flu symptoms by more than one day when taken within the first 48 hours.