More than 3,000 people in Colorado have already been hospitalized for the flu this year.

According to the Colorado Department of Public Health and Environment, during the last week alone there were 173 additional hospitalizations.

Mesa and Pueblo counties, along with Rio Blanco, Saguache, Rio Grande, Conejos, Alamosa and Huerfano counties had the highest rate of hospitalizations in Colorado.

CDPHE says the flu has sent more people 65 years old and older to the hospital than any other age group – making up nearly 58 percent of the hospitalizations.

Click or tap here to read the Colorado Flu Report

9NEWS Medical Expert Dr. Comilla Sasson says it’s kind of virus season right now.

“There’s a lot of crud going around,” Sasson said.

On top of the flu, there are other illnesses to worry about, and a lot of cases that she’s recently seen in the ER.

She’s seen cases of Norovirus, which is the same virus that has infected more than 100 people in South Korea ahead of the winter Olympics in PyeongChang. Those symptoms include nausea, vomiting and diarrhea.

“Norovirus is very contagious and that’s why we’re seeing it at the Olympics," Sasson said. "It’s in a small and contained area, and it’s transferred by surfaces…It can definitely make you feel like you got run over by a truck, you don’t want to get out of bed, you have vomiting and diarrhea.”

Dr. Sasson has also seen several cases of Adenovirus. Those symptoms are similar to the cold, where patients have a fever, sore throat and cough.

Both Adenovirus and Norovirus are highly contagious and spread quickly in close quarters, including schools, daycare and even potentially Olympic villages.

Another illness, Respiratory Syncytial Virus Infection, can be dangerous for young children.

“It’s one of those things we worry about, mostly in young kids, in infants, and kids with asthma and who have respiratory conditions and lung issues because once they get it, they have a hard time breathing and they can deteriorate pretty rapidly,” Sasson said.

Children with the illness sometimes end up needing a ventilator and medications to keep the airways open.

You can learn more about the different illnesses here:





The best advice Dr. Sasson has for not getting sick is to wash your hands and stay away from people who are sick.