State health officials in the Mexican state of Tamaulipas confirmed that five people tested positive for the Delta variant of COVID-19.

The people who tested positive were a 55-year-old man, a 63-year-old woman, a 42-year-old woman, a 79-year-old man, and another 63-year-old woman in the municipalities of Matamoros, Reynosa, Ciudad Victoria and Tampico, according to a Thursday news release from the Secretary of Health of Tamaulipas.

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The Tamaulipas government and Ministry of Health are working to identify other suspected cases.