The first reports indicate that the flea and tick plague was caused by the presence of raccoons outside the vicinity of the IMSS in Matamoros.
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The staff of the clinic N.39 of the IMSS in Matamoros pointed out that the plague of fleas and ticks has been present for 10 years, but the situation has already worsened.
The institute reported that the situation is associated with raccoons that roam outside the unit and said it has no records of affecting patients or workers.