Washington's Metro subway system is asking riders to take precautions to avoid spreading swine flu, ranging from covering your mouth when sneezing to carrying tissues, hand-sanitizing gels, and disinfecting wipes.

Metro says it also is using an environmentally friendly disinfectant cleaner to wipe down surfaces throughout the system.

Metro Chief Safety Officer Alexa Dupigny-Samuels says good personal hygiene can cut the risk of catching the disease.

More than 1 million people ride Metro trains each day.

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