What is monkey pox? A microbiologist explains what we know about the virus

State health officials are warning people to be vigilant after two cases of monkeypox were confirmed in New South Wales and Victoria.

The cases – a man in his 40s in NSW and another man in his 30s in Victoria – had both recently traveled to Europe and are now in isolation.

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Monkeypox is not a new disease.

the the first confirmed human case dates back to 1970when the virus was isolated from a child suspected of having smallpox in the Democratic Republic of Congo (DRC).

Monkeypox is unlikely to cause another pandemic, but with COVID-19 in mindthe fear of another major outbreak is understandable.

Although rare and usually mild, monkeypox can still potentially cause serious illness. Health officials fear more cases will arise with increased travel.

I am a researcher who has worked in medical and public health laboratories for more than three decades, particularly in the field of diseases of animal origin.

What exactly is happening in the current epidemic and what does history tell us about monkeypox?

A cousin of smallpox

Monkeypox is caused by the monkeypox virus, which belongs to a subset of the Poxviridae family of viruses called Orthopoxvirus.

This subset includes smallpox, the vaccine and cowpox viruses.

While a the animal reservoir of monkeypox virus is unknown, African rodents are suspected to play a role in transmission. Monkeypox virus has only been isolated twice from an animal in the wild.

Diagnostic Tests for Monkeypox is currently available only from Laboratory Response Network labs in the United States and worldwide.

The name “monkeypox” comes from first documented cases disease in animals in 1958, when two outbreaks occurred in research monkeys.

However, the virus did not jump from monkeys to humans, and monkeys are not the main carriers of the disease either.

NSW CHO Dr Kerry Chant warns of Monkeypox.

NSW CHO Dr Kerry Chant warns of Monkeypox.

Epidemiology

Since the first reported human case, monkeypox has been discovered in several other countries in Central and West Africawith the majority of infections in the DRC.

Cases outside of Africa have been linked to international travel or imported animals.

Since monkeypox is closely related to smallpox, the smallpox vaccine can provide protection against infection by both viruses.

However, since smallpox has been officially eradicated, routine smallpox vaccinations for the entire world population have been stopped. For this reason, monkeypox has been appearing more and more in unvaccinated people.

Transmission

The virus can be transmitted through contact with an infected person or animal or contaminated surfaces.

As a rule, the virus enters the body through damaged skin, by inhalation or through the mucous membranes of the eyes, nose or mouth.

Researchers believe human-to-human transmission occurs primarily through inhalation of large respiratory droplets rather than direct contact with bodily fluids or indirect contact through clothing.

Human-to-human transmission rates of monkeypox have been limit.

Health officials fear that the virus is currently spreading undetected through community transmission, possibly through a new mechanism or pathway.

Where and how infections occur are still under investigation.

Monkey pox signs and symptoms

Once the virus has entered the body, it begins to replicate and disseminate through the body via the bloodstream. Symptoms usually do not appear until one to two weeks after infection.

Monkeypox produces smallpox-like skin lesions, but symptoms are generally milder than those of smallpox.

Flu-like symptoms are common at first, ranging from fever and headache to shortness of breath.

One to 10 days later, a rash may appear on the extremities, head, or torso that eventually turns into pus-filled blisters.

In this graphic from the Centers for Disease Control and Prevention, one of the symptoms of the monkeypox virus is seen on a patient’s hand. Credit: Getty Images/Getty Images

Overall, symptoms usually last two to four weeks, while skin lesions usually heal in 14 to 21 days.

Although monkeypox is rare and usually non-fatal, a version disease kills about 10% of those infected. The form of the virus currently circulating is thought to be milder, with a fatality rate of less than 1%.

Vaccines and treatments

Monkey pox treatment is primarily focused on symptom relief. According to the CDC, no treatment is available to cure monkeypox infection.

Evidence suggests that the smallpox vaccine can help prevent monkeypox infections and reduce the severity of symptoms. A vaccine known as Imvamune or Imvanex is licensed in the United States to prevent monkeypox and smallpox.

Vaccination after exposure to the virus can also help reduce the risk of serious illness. The CDC currently recommends smallpox vaccination only in people who have been or are likely to be exposed to monkeypox. Immunocompromised people are high risk.

Rodney E. Rohde is Regents Professor of Clinical Laboratory Sciences, Texas State University

This article first appeared in The conversation

Monkeypox outbreak 2022

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