MINNEAPOLIS (WCCO) — When you think of a bad cold, most think of it happening during the winter. But a summer cold may actually be worse for you to deal with.

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Doctors say cold and flu viruses that make people sick in the winter often combine with other warm weather viruses in the summer, including a nasty bug called the “enterovirus.”

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They say that combo can cause stomach problems and a cough that just won’t go away. It can last longer and it’s more likely to come back.

“It really taxes the immune system more. They’re more run down and I think that’s what’s making it last longer,” said Dr. Lisa Liberatore with the Lexington Wellness Center.

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Air conditioning and recycled air on planes can also spread virus. Doctors say keep washing your hands, get plenty of sleep and stay hydrated to try to avoid getting sick.