The U.S. Centers for Disease Control and Prevention has stepped up its monkeypox guidance, urging travelers to take extra precautions including wearing face masks as global cases of the virus surpass 1,000.

The CDC ramped up its alert to a level 2 on Monday, encouraging people to “practice enhanced precautions” to stem the outbreak, which has spread to 29 non-endemic countries in the past month. The highest level alert — level 3 — would caution against non-essential travel.

While the public health body said the risk to the general public remains low, the heightened alert encourages people to avoid close contact with sick people, including those with skin or genital lesions, as well as sick or dead animals.

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