A worrisome international outbreak of monkeypox, a less harmful cousin of the smallpox virus, has now reached the United States and Canada.
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What is monkeypox?
Monkeypox is a rare disease, which generally occurs in remote parts of Central and West Africa. The virus was first discovered in 1958 when two outbreaks of a pox-like disease occurred in monkeys. The first known human case occurred in 1970 in the Democratic Republic of the Congo, and it has since been reported in humans in other central and western African countries, according to the CDC.
As of Saturday, 92 confirmed cases of the illness, and 28 more suspected cases, have been reported across 12 countries, according to the World Health Organization.
Cases of monkeypox had previously been seen only among people with links to central and West Africa, according to the Associated Press. But in the past week, the United States was among seven countries reporting infections, mostly in young men who hadn't previously traveled to Africa.
France, Germany, Belgium and Australia confirmed their first cases on Friday, the AP reported.
Between 1 and 5 confirmed cases are currently under investigation in the United States, WHO said.
The latest wave of monkeypox was first seen in the United Kingdom, Portugal, Spain and other parts of Europe in early May. On Friday, the U.S. Centers for Disease Control and Prevention was monitoring six people in the United States for possible infection. They sat near one infected traveler on a flight from Nigeria to the United Kingdom in early May.
CDC officials are also investigating a confirmed case of monkeypox in a Massachusetts man who recently traveled to Canada, according to CNN. And the New York City Health Department is probing a possible infection in a patient at Bellevue Hospital there.
Monkeypox symptoms
The illness begins with fever, swollen lymph nodes and other flu-like symptoms (chills, headache, muscle aches and fatigue), followed by a telltale rash on the face that spreads to other areas, including genitals, hands and feet.
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The rash typically affects the...
- face, which is the most common site
- palms of the hands
- soles of the feet
- mouth
- genitalia
- eyes, including the conjunctivae and cornea
The rash consists of lesions that evolve in the following order:
- macules, or flat discolored lesions
- papules, or slightly raised lesions
- vesicles, or bumps with clear fluid
- pustules, or bumps with yellowish fluid
- scabs
A rash caused by monkeypox can cause severe itching and go through several stages before the legions scab and fall off.
A monkeypox infection typically lasts two to four weeks and usually clears up on its own.
"It can last for several weeks, and people can feel fairly ill," says Anne Rimoin, chair of infectious diseases and public health at the University of California, Los Angeles.
How do you get monkeypox virus?
Monkeypox is primarily spread from animals to humans — and less often from person to person because close contact with bodily fluids is needed, adds Hannah Newman, director of epidemiology at Lenox Hill Hospital in New York City.
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Risk factors for past outbreaks included contact with live or dead animals and consumption of wild game or bush meat from wild animals, Newman adds.
Once the virus jumps from an animal to a human, human-to-human transmission can occur through direct contact with respiratory droplets, bodily fluids or skin lesions.
Animal-to-human transmission, on the other hand, may occur through a bite or scratch.
The virus can enter the body through broken skin, the respiratory tract or through the eyes, nose and mouth.
"Anyone experiencing an unusual rash or lesion and who has risk factors [or had sexual encounters with someone who has] should seek care immediately," she says.
Many of the newer cases worldwide have occurred among gay and bisexual men.
On Monday Enrique Ruiz Escudero, senior health official in the Spanish capital of Madrid, said the city has recorded 30 confirmed cases of monkeypox so far. He said authorities are investigating potential links between a recent Gay Pride event in the Canary Islands, which drew some 80,000 people, and cases at a Madrid sauna.
According to Newman, "it appears that there may be a sexual transmission component to the current outbreak, which we haven't seen in previous outbreaks." Gay or bisexual men may be at special risk during the current outbreak, she notes.
Monkeypox treatment
Although there are no proven safe treatments for monkeypox, doctors are certain that the virus can be controlled.
"I feel like this is a virus we understand, we have vaccines against it, we have treatments against it, and it's spread very differently than SARS-CoV-2 (the virus that causes COVID-19)," Dr. Ashish Jha, the White House COVID-19 response coordinator, told ABC News on Sunday.
"It's not as contagious as COVID. So I am confident we're going to be able to keep our arms around it," Jha says. "But we'll track it very closely and use the tools we have to make sure we can continue to prevent further spread and take care of the people who get infected."
Smallpox vaccines, antivirals, and vaccinia immune globulin (VIG) can be used to treat monkeypox and have been proven to be effective at preventing the spread of the virus. The U.K. and Spain are now offering the vaccine to those who have been exposed to infections to help reduce symptoms and limit the spread.
In fact, the U.S. government has already placed a $119 million order for the vaccine with an option for more. British health authorities are offering smallpox shots to some health care workers and others who may have been exposed to monkeypox.
Is monkeypox deadly?
In Africa, anywhere from 1% to 15% of people with monkeypox will die from the virus. "Severe disease and [death] is higher among children, young adults, and immunocompromised individuals," Newman adds.
While it does not occur naturally in the United States, this is not the first time monkeypox has been seen in the nation. A 2003 outbreak was linked to infected prairie dogs imported as pets.
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Still, many questions about the new outbreak remain.
"We need to monitor it and understand how it is behaving and how it has been introduced into the new population," Rimoin shares.
This outbreak appears to be linked to the West African strain of monkeypox, which Rimoin says is less transmissible and tends to cause milder symptoms than the central African strain.
"Once these details become available, we will know a lot more," she notes.
The outbreak isn't totally surprising, she adds. In recent years, cases of the once-eradicated smallpox virus have also popped up. "It is not surprising that we see other poxviruses occurring through the world as a result," Rimoin says.
The good news is that outbreaks of monkeypox are rare and usually short-lived, Newman says.
The 2003 U.S. outbreak, for example, was quickly contained through extensive testing, deployment of smallpox vaccine and treatments, and guidance for patients, health care providers, veterinarians and other animal handlers.
"All 47 people recovered, and none of the 47 cases spread the illness to another person," she adds.
"I'm stunned by this. Every day I wake up and there are more countries infected," says virologist Oyewale Tomori, who sits on several World Health Organization advisory boards.
"This is not the kind of spread we've seen in West Africa, so there may be something new happening in the West," he told the AP.
Despite all of these recent infections in areas where the virus is uncommon, and newfound concern that the disease may spread through sexual contact, health experts are warning against overreacting. Unlike newly emerging diseases like COVID-19, monkeypox is well understood and effective treatments are available.
"Nobody should be panicking," says Anne Rimoin, chair of infectious diseases and public health at the University of California, Los Angeles. "Monkeypox is a known virus that is being introduced into a new population."
How do you prevent monkeypox virus?
Prevention depends on decreasing human contact with infected animals and limiting person-to-person spread. According to Cleveland Clinic, you can prevent monkeypox virus by:
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- Avoiding contact with infected animals (especially sick or dead animals).
- Avoiding contact with bedding and other materials contaminated with the virus.
- Washing your hands with soap and water after coming into contact with an infected animal.
- Thoroughly cooking all foods that contain animal meat or parts.
- Avoiding contact with people who may be infected with the virus.
- Using personal protective equipment (PPE) when caring for people infected with the virus.
If you experience new rashes or are concerned about monkeypox, contact your healthcare provider. To diagnose monkeypox, your healthcare provider will take a tissue sample that is looked at using a microscope. You may also need to give a blood sample to check for the monkeypox virus or antibodies your immune system makes to it.