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Monkeypox: How do you Get Infected, Symptoms and What are the Risks?

The latest outbreak of monkeypox has, at the time of writing, reached 17 countries with 110 confirmed cases and a further 205 suspected cases.

Why is it called monkeypox?

Monkeypox was first identified in laboratory monkeys (macaques) in Denmark in 1958, hence the name. However, monkeys don’t seem to be the natural hosts of the virus. It is more commonly found in rats, mice, and squirrels. The first case in humans was seen in the 1970s in the Democratic Republic of the Congo.

Ways of Spreading

The first patient in the current outbreak had returned to the UK from travels to Nigeria where monkeypox is endemic. However, cases are now spreading among people who have not traveled to the west or central Africa, suggesting local transmission is occurring.

Monkeypox usually spreads by close contact and respiratory droplets. However, sexual transmission (via semen and/or vaginal fluid) has been posited as an additional possible route. The World Health Organization (WHO) says: “Studies are needed to better understand this risk.”

Most cases in the current outbreak have been in young men, but the virus can spread to anyone.

Symptoms

Early symptoms are flu-like, such as a fever, headaches, aching muscles, and swollen lymph nodes.

Once the fever breaks, a rash can develop, often beginning on the face and then spreading to other parts of the body – most commonly the palms of the hands and soles of the feet.

How deadly is monkeypox?

Monkeypox is mostly a mild, self-limiting disease lasting two-to-three weeks. However, in some cases, it can cause death. According to the WHO, the fatality rate “in recent times” has been around 3% to 6%. The West African monkeypox virus is considered to be milder than the central African one.

Monkeypox tends to cause more serious diseases in people who are immune-compromised – such as those undergoing chemotherapy – and children. There have been no deaths from monkeypox in the current worldwide outbreak, but, according to the Daily Telegraph, one child in the UK is in intensive care with the disease.

Is monkeypox related to smallpox and chickenpox?

Monkeypox is related to smallpox – they are both orthopoxviruses – but it is not related to chickenpox. Despite the name, chickenpox is a herpes virus, not a pox virus. (How “chicken” got in the name is not entirely clear. In his dictionary of 1755, Samuel Johnson surmised that it is so named because it is “of no very great danger”.) Nevertheless, the vesicles (little pus-filled blisters) caused by monkeypox are similar in appearance to those of chickenpox.

Are cases likely to continue rising?

Cases are likely to continue to rise significantly over the next two-to-three weeks, but this is not another pandemic in the making. Monkeypox doesn’t spread anywhere near as easily as the airborne virus SARS-CoV-2 that causes COVID-19.

Has monkeypox evolved to be more virulent?

RNA viruses, such as SARS-CoV-2, don’t have the ability to check their genetic code for mistakes each time they replicate, so they tend to evolve faster. Monkeypox is a DNA virus, which does have the ability to check itself for genetic mistakes each time it replicates, so it tends to mutate a lot slower.

The first genome sequence of the current outbreak (from a patient in Portugal) suggests that the virus is very similar to the monkeypox strain that was circulating in 2018 and 2019 in the UK, Singapore, and Israel. So it is unlikely that the current outbreak is the result of a mutated virus that is better at spreading.

Is there a vaccine for it?

Vaccines for smallpox, which contain the lab-made vaccinia virus, can protect against monkeypox. However, the vaccine that was used to eradicate smallpox can have severe side effects, killing around one in a million people vaccinated.

The only vaccine specifically approved for monkeypox, Imvanex, is made by a company called Bavarian Nordic. It uses a nonreplicating form of vaccinia, which causes fewer side effects. It was approved by the US Food and Drug Administration and the European Medicines Agency in 2019 – but only for use in people 18 years of age or older.

UK health secretary Sajid Javid said that the UK government will be stocking up on vaccines that are effective against monkeypox. The UK currently has about 5,000 doses of the smallpox vaccine, which has an efficacy of around 85% against monkeypox.

Are there drugs to treat it?

There are no specific drugs to treat monkeypox. However, antivirals such as cidofovir and brincidofovir have been proven to be effective against poxviruses in animals and may also be effective against monkeypox infections in humans.

 

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