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(CNN)Covid-19 variants are threatening to cause another surge of infections, health officials warned Wednesday, and it’s now more important than ever for Americans to continue practicing safety measures that work against the spread of the virus.”The continued spread of variants that are more transmissible could jeopardize the progress we have made in the last month if we let our guard down,” Centers for Disease Control and Prevention Director Dr. Rochelle Walensky said during a White House briefing.But by lowering cases, the US will give “fewer opportunities for the variants to spread and fewer opportunities for new variants to emerge,” she added.