Nov 4, 2026 · 26 min · 20 segments
In this episode of Outbreak Watch, we're tracking several outbreaks that are expanding, crossing geographic boundaries, or raising important questions about how well public health responses are…
Heather LanderHost
On November 3rd, USDA's New World Screwworm Dashboard reported 91 cumulative animal cases in the U.S., 90 in domestic animals and one in wildlife or a feral animal.
Compare that with October 9th, when we had 52 cases all in domestic animals, and only two were active.
An active case is an animal-level status, but it doesn't tell us how many flies are present in a county or whether transmission has stopped around an animal once its case becomes inactive.
When I wrote about this in last week's newsletter, the October total was only 14 at that point.
Confirmed cases have been reported in Texas, New Mexico, and now in Arizona, where a dog in Cochise County became the state's first confirmed case in late October.
On October 21, USDA announced an infestation in an elk in Pecos County, Texas, the first confirmed U.S. case in wildlife.
The dashboard now lists five wild screwworm fly trap detections, up from the one fly we discussed last time.
A trap detection can't tell us where that fly developed, which animal it came from, or whether a breeding population is now sustaining itself in that area.
On November 3rd, USDA's New World Screwworm Dashboard reported 91 cumulative animal cases in the U.S., 90 in domestic animals and one in wildlife or a feral animal.
Compare that with October 9th, when we had 52 cases all in domestic animals, and only two were active.
An active case is an animal-level status, but it doesn't tell us how many flies are present in a county or whether transmission has stopped around an animal once its case becomes inactive.
When I wrote about this in last week's newsletter, the October total was only 14 at that point.
Confirmed cases have been reported in Texas, New Mexico, and now in Arizona, where a dog in Cochise County became the state's first confirmed case in late October.
On October 21, USDA announced an infestation in an elk in Pecos County, Texas, the first confirmed U.S. case in wildlife.
The dashboard now lists five wild screwworm fly trap detections, up from the one fly we discussed last time.
A trap detection can't tell us where that fly developed, which animal it came from, or whether a breeding population is now sustaining itself in that area.
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