This Is Not the Monkeypox That Doctors Thought They Knew

Early in the monkeypox outbreak, a man in his 20s arrived at an emergency department in Northern California, tiny blisters on his lips, hands and back. Within 12 hours, doctors diagnosed him with monkeypox.

That’s where their certainty ended. The patient did not have fever, aches, weakness, pain or other symptoms typical of the disease. He did not know when or how he had become infected. He had not had sexual contact with anyone for months, he said, and had not touched — as far as he knew — anyone with pox, as the lesions are called, or other symptoms.

At the onset of the outbreak, scientists thought they knew when and how the monkeypox virus was spread, what the disease looked like and who was most vulnerable. The 44,000 cases identified worldwide have upended many of those expectations.

Monkeypox patients have turned up with what looked like mosquito bites, pimples or ingrown hairs, not the large pustules usually associated with the infection. Some did not even have visible lesions but felt excruciating pain when swallowing, urinating or emptying their bowels.

Some had headaches or depression, confusion and seizures. Others had severe eye infections or inflammation of the heart muscle. At least three of the six deaths reported so far were linked to encephalitis, an inflammation of the brain.

“We really are seeing a very, very wide range of presentation,” said Dr. Boghuma Titanji, an infectious disease physician at a clinic in Atlanta that serves people living with H.I.V.

Scientists now know that the monkeypox virus lurks in saliva, semen and other bodily fluids, sometimes for weeks after recovery. The virus has always been known to spread through close contact, but many researchers suspect the infection may also be transmitted through sex itself.

The California patient had virus in his throat, but no respiratory symptoms, and in his rectum, but without pain or pox. The case underscores other research suggesting that the virus may be spread even by people with atypical or asymptomatic infections, said Dr. Abraar Karan, who diagnosed the patient and published a recent case report.

In another study, also published this month, anal swabs of 200 men without symptoms turned up 13 who were positive for monkeypox. Only two of them later developed symptoms.

A patient with monkeypox sores in a hospital in Lima, Peru.Credit…Ernesto Benavides/Agence France-Presse — Getty Images

“It’s no longer correct to say it can’t be transmitted asymptomatically,” said Dr. Chloe Orkin, an infectious disease physician at Queen Mary University of London. “I think that it means that our working model of how it’s spread is incorrect.”

Early in the outbreak, the C.D.C. said that “people who do not have monkeypox symptoms cannot spread the virus to others.” The agency changed that phrasing on July 29 to say that “scientists are still researching” the possibility of asymptomatic transmission.

In a statement to The New York Times, an agency spokeswoman acknowledged recent evidence that asymptomatic cases were possible but said that it was still uncertain whether people without symptoms could spread the virus and that more research was needed.

What to Know About the Monkeypox Virus

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What to Know About the Monkeypox Virus

What is monkeypox? Monkeypox is a virus similar to smallpox, but symptoms are less severe. It was discovered in 1958, after outbreaks occurred in monkeys kept for research. The virus was primarily found in parts of Central and West Africa, but recently it has spread to dozens of countries and infected tens of thousands of people, overwhelmingly men who have sex with men.

What to Know About the Monkeypox Virus

What are the symptoms? People who get sick commonly experience a fever, headache, back and muscle aches, swollen lymph nodes, and exhaustion. A few days after getting a fever, most people also develop a rash that starts with flat red marks that become raised and filled with pus. On average, symptoms appear within six to 13 days of exposure, but can take up to three weeks.

What to Know About the Monkeypox Virus

How does it spread? The monkeypox virus can spread from person to person through close physical contact with infectious lesions or pustules, by touching items — like clothing or bedding — that previously touched the rash, or via the respiratory droplets produced by coughing or sneezing. Monkeypox can also be transmitted from mother to fetus via the placenta or through close contact during and after birth.

What to Know About the Monkeypox Virus

I fear I might have monkeypox. What should I do? There is no way to test for monkeypox if you have only flulike symptoms. But if you start to notice red lesions, you should contact an urgent care center or your primary care physician, who can order a monkeypox test. Isolate at home as soon as you develop symptoms, and wear high-quality masks if you must come in contact with others for medical care.

What to Know About the Monkeypox Virus

What is the treatment for monkeypox? If you get sick, the treatment for monkeypox generally involves symptom management. Tecovirimat, a hard-to-obtain antiviral drug also known as TPOXX, occasionally can be used for severe cases. The Jynneos vaccine, which protects against smallpox and monkeypox, can also help reduce symptoms, even if taken after exposure.

What to Know About the Monkeypox Virus

Who can get the vaccine? Jynneos vaccine is most commonly used to prevent monkeypox infections, and consists of two doses given four weeks apart. It has mostly been offered to health care workers and people who have had a confirmed or suspected exposure due to limited supplies, though new doses should become available in the coming months. A few states, including New York, have also made vaccines available among higher-risk populations.

What to Know About the Monkeypox Virus

I live in New York. Can I get the vaccine? Adult men who have sex with men and who have had multiple sexual partners in the past 14 days are eligible for a vaccine in New York City, as well as close contacts of infected people. Eligible people who have conditions that weaken the immune system or who have a history of dermatitis or eczema are also strongly encouraged to get vaccinated. People can book an appointment through this website.

When the first few dozen cases of monkeypox emerged in Europe, spreading of the virus through sexual contact and genital lesions came as a surprise to many scientists. But it shouldn’t have.

Nigerian researchers reported a similar pattern in 2017, when they documented 228 cases, many of them young men with genital ulcers. (The patients identified as heterosexual in a subsequent study, but Nigeria criminalizes same-sex behavior.)

Those cases were the first reported in Nigeria in 40 years, and the World Health Organization helped the country “mount the local response, with the goal to control spread,” said Fadela Chaib, a spokeswoman for the organization.

But the unusual symptoms of the patients went unnoticed. “If what is happening in Europe and the global North had not happened, I don’t think that paper would be discussed,” said Dr. Dimie Ogoina, who led a study describing the cases.

“We have this disease that’s more than 50 years old, and there’s a lot of things we still don’t know — and that’s because the condition has been largely restricted to Africa,” he said.

In late May, Dr. Orkin contacted several international colleagues to put together what turned out to be the largest study of monkeypox. Hundreds of physicians from 16 countries eventually contributed information about the cases they were seeing.

They changed the reporting forms as the disease came into sharper focus, adding the possibility of a single pox, lesions in the throat or rectum, and medical complications — features that were “not included in international case definitions of monkeypox,” Dr. Orkin said.

The resulting analysis of 528 patients was published in The New England Journal of Medicine on July 21. A few days later, Dr. Orkin alerted several national health agencies, knowing the findings should alter the case definitions that doctors consult when diagnosing patients.

Dr. Chloe Orkin, an infectious disease physician at Queen Mary University of London. “I’ve got a loud voice,” she said, “and I’m still finding it difficult to get a response.”Credit…Suzie Howell for The New York Times

Britain’s Health Security Agency and the European Centers for Disease Control both replied the same day. Britain added some of the new symptoms to its monkeypox case definition three days later. The European agency invited Dr. Orkin to present her findings.

In an interview in late July, Dr. Orkin reflected that during pandemics, public health agencies are considered the experts, and officials educate doctors on the disease and its treatment. Yet it’s clinicians who see the symptoms firsthand.

“It seems to me that consulting with clinicians in the field may have been helpful,” she said. National health agencies have been slow to understand the virus’s many manifestations in the current outbreak, she added.

Dr. Orkin is president of the Medical Women’s Federation, past president of the British H.I.V. Association and a governing council member of the International AIDS Society. “I’ve got a loud voice,” she said, “and I’m still finding it difficult to get a response.”

Senior members of the W.H.O. responded to Dr. Orkin on Aug. 2, asking to discuss the cases that she and her colleagues had described. The C.D.C. did not reply to Dr. Orkin but added rectal pain and bleeding, along with other new symptoms, to its guidance to clinicians on Aug. 5.

The new C.D.C. definition mentions lesions in the mouth but does not describe the range or importance of pox in the mouth, eyes and urethra. In its statement, the agency said it was aware of Dr. Orkin’s findings and had begun studies “that will help us better understand the range and importance of lesions at these and other bodily sites.”

Based on reports that the virus persists in semen for weeks, Britain recommended that men who recover from monkeypox use condoms for 12 weeks after infection, a tacit acknowledgment that this may be a transmission route.

The C.D.C. has not gone along, saying that “researchers are working with our partners to learn if, and how frequently, the virus is being spread through contact with semen.”

The agency should advise men to wear condoms for a few weeks, as Britain has, Dr. Karan said. “We do not know how long people can transmit through semen,” he said. “I think they should communicate that clearly.”

For patients, outdated case definitions and guidance can have serious implications. Cameron French, 30, was exposed to the virus on July 6. Two weeks later, he developed a sore throat, head and body aches, painful urination and three bumps — on his face, a thigh and an elbow.

Yet on his first visit to a clinic, on July 25, his doctor did not connect the symptoms. She told him the bump on his thigh was an ingrown hair and tested him for a urinary tract infection.

He went back three days later. This time, the doctor agreed to test him for monkeypox. After he tested positive, he had to push once again, this time to get the antiviral tecovirimat.

Mr. French said he was most frustrated by the lack of guidance on how to distinguish a potential new pox from a pimple so he could end his monthlong isolation. “That’s been a big ambiguous question mark,” he said. “That’s been hard.”

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