These Birds Didn’t Have Chlamydia or West Nile. But They’re Still Dying.

Jim Tinnell, a wildlife rehabilitator in Ohio, was suspicious when he obtained his first sick blue jay of the season on May 24.

“Blue jays just don’t come into rehab that often,” he mentioned, citing his 40 years of expertise rehabbing birds. “They’re great parents.”

Three days later, he had six sick songbirds in his care. All the birds appeared emaciated and functionally blind, their eyes crusted shut. Mr. Tinnell gave every hen a heat eye compress and utilized antibiotic ointment, to no avail. All the birds died inside 48 hours.

In the weeks following, Mr. Tinnell took in hen after hen, every with the identical eye situation. Before they died, many developed neurological signs: Their heads bobbed again, their our bodies bounced, and their blind eyes fixated upward towards the sky. Many of the troubled birds have been blue jays, grackles and starlings.

This hen illness has been reported in 10 states, together with Virginia, Maryland, West Virginia, Indiana, Ohio and Kentucky, the place wildlife businesses have been additionally inundated with experiences.

The trigger of those signs stays mysterious. But on Friday, the United States Geological Survey, which has coordinated an investigation of the illness among the many states, concluded in a press release circulated to wildlife businesses that it might rule out plenty of pathogens that had not been detected within the troubled birds.

Those which have been dominated out embrace maladies like avian influenza and West Nile, which have unfold amongst hen species and may generally leap to people. Others on the record are salmonella, chlamydia and a bunch of flaviviruses, herpesviruses and Trichomonas parasites, in line with Dr. Christine Casey, a state wildlife veterinarian for the Kentucky Department of Fish and Wildlife Resources.

Several diagnostics laboratories are persevering with to check samples for potential bacterial ailments, viruses, parasites and toxins, Dr. Casey mentioned. In July, workers at wildlife businesses mentioned, experiences appear to be tapering — though it’s unclear whether or not that signifies that the virus is receding or that persons are not reporting instances. City Wildlife in Washington, D.C., obtained one case in April; 91 in May; and 62 within the first week of June. Now, the vets see solely two to 4 instances every week, mentioned Dr. Cheryl Chooljian, the clinic’s director.

A younger blue jay with swollen eyes. Mr. Tinnell has nursed eight fledglings again to full well being, he mentioned.Credit…Jim Tinnell

In Dr. Chooljian’s expertise, not all of the birds show the identical signs. Some have solely the crusty eyes, with extreme swelling and white mucus discharge. Others have simply neurological points, twitching their eyes, arching their neck, or circling or rolling their our bodies in a seemingly countless cycle.

A overwhelming majority of diseased birds taken into clinics and rehabilitation facilities have died. At City Wildlife, all of the birds arrived with such extreme signs that they died inside days or their illness progressed to the purpose that they needed to be euthanized. “Not being able to do anything but relieve the suffering of these birds has been a very emotionally taxing experience,” Dr. Chooljian wrote in an electronic mail.

Nearby, the Wildlife Center of Virginia was additionally overrun with sick birds that didn’t reply to treatment. “I’ve never lost so many birds before,” mentioned Jennifer Toussaint, the chief animal management officer on the heart. Out of concern that the illness might be contagious to different birds, each City Wildlife and the Wildlife Center of Virginia now suggest placing the birds down on consumption.

Although the reason for the illness formally stays a thriller, folks have proffered plenty of theories. On the web, the favourite wrongdoer is Brood X, the periodical cicadas that spent the final 17 years underground solely to emerge this 12 months in teeming, singing plenty, across the time the hen illness emerged. Though many cicadas’ long-awaited bacchanalia has gone off and not using a hitch, others have fallen prey to a zombifying white fungus, which some have speculated might be the reason for the illness.

To Dr. Chooljian, the attention signs initially resembled these related to the illness mycoplasma conjunctivitis, additionally known as home finch eye illness. But the sick birds didn’t reply to the clinic’s standard remedies for home finch eye illness which, she added, doesn’t trigger neurological signs.

“Who knows at this point,” Dr. Casey mentioned, including that she doesn’t need to rule out something however doubts the cicada speculation. “In general, more of us are leaning toward an emerging bacterial infection,” she added, pointing to the attention lesions that appear just like the bacterium-caused conjunctivitis.

The full outcomes from the diagnostics lab might not come for a number of extra weeks, in line with Dr. Casey. The useless birds, their eyeballs and their flesh have been put by a battery of molecular checks for fungi, parasites and micro organism. There remains to be a risk, nonetheless, that each one these checks can be inconclusive, she mentioned, including that the diagnostics lab is holding on to a handful of corpses for retrospective testing in future years.

In Ohio, all of the grownup birds Mr. Tinnell obtained died inside a number of days. But he has nursed eight fledglings again to full well being, he mentioned. The younger birds additionally arrived in poor situation, eyes crusted shut, however Mr. Tinnell mentioned they responded effectively to his course of therapy: heat eye compresses, oral antibiotics and an antibiotic eye ointment twice a day. Some birds opened their eyes in as little as three days, he mentioned.

“They’re looking at me right now, and they’re absolutely beautiful,” Mr. Tinnell mentioned, an incessant medley of chirps audible on the opposite line.