Morgan and Megan Lominack are twins and your typical 10-year-olds.

But the sisters were born premature, weighing barely two pounds. When they were 15-months-old, they got very sick.

A seasonal virus you may not know about is spreading across the Houston area and it’s hospitalizing hundreds of children.

“It was very scary,” said the girls’ mother Diane Lominack. “(You) wonder if your child would take their next breath.”

The girls developed Respiratory Syncytial Virus, commonly known as RSV. It is a respiratory tract infection with symptoms that are much like the common cold or the flu.

On a scan of a child’s lungs, visible white spots are actually RSV cells attacking the lungs. The more cells, the more dangerous it can be.

Because, in young babies RSV can lead to bronchiolitis or pneumonia.

“Sometimes they can stop breathing and turn blue,” said Dr. Pedro Piedra. “Other times they can start breathing much quicker.”

Houston area hospitals say the RSV outbreak in young children is at an all time high. And nobody is sure why.

Doctors do know it is a seasonal illness that is spread by human contact. Unfortunately, preventing that is almost impossible.

Statistics indicate one out of every two babies will at some point contract RSV. What's more, every baby under the age of two will get it.

Here’s the good news: Most cases of RSV in young children are treated with oxygen and fluids until the virus runs its course.

Megan and Morgan were hospitalized for 10 days because their parents didn't want to take the gamble.