A local CBS affiliate, KDKA-TV, interviewed a resident about what she is witnessing:
“They seem to be sick, doesn’t seem to be rabies. The reason why they are saying they are sick is because they are not responding, moving or running away from them and they are listless. It’s like they are dying,” said Meyer.
Their video says there are hundreds of these sick animals, mainly raccoons and groundhogs, and that police say they have shot 500 so far.
However, the article that embeds the above video reports the numbers of affected animals as being dozens, rather than hundreds, and also reports that there is a theory about what is making the animals sick:
“Ross Township Police think it could be an oral rabies vaccine that state and county agencies have placed in wooded areas, either on foot, or dropped from low-flying planes or helicopters.”
Dogs have been sickened when they consume baited rabies vaccines intended for wildlife, so it is possible that wildlife also react badly to the antibiotics used to mark teeth and bones as evidence of exposure to the vaccines. But I don’t think the horror show happening in Pennsylvania has ever been reported before in connection with baited rabies vaccine, whether the numbers of sick animals are in the hundreds or in the dozens. The antibiotics in the vaccine would have to have been very degraded to affect so many animals.
The virus in the vaccine being used is a live one engineered from a strain of vaccinia virus with a higher risk of causing encephalitis than the strain preferred for use in humans and pets, (at least I read that was the case in Europe.) Vaccinia is a pox virus that was cultured for use as a smallpox vaccine virus. It has escaped into the wild in the past, though, and evolved into something new. Within a few years of the discovery of vaccinia in mice in Brazil, escaped vaccinia was infecting cows and humans.
Something is making those poor animals very sick, so I hope the mystery is solved quickly. Possibly rather than the rabies vaccine’s vaccinia virus evolving into something lethal, another disease like distemper is morphing to fill the ecological niche vacated by attempts to eradicate rabies in wildlife. Nature abhors a vacuum.