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Independent News Express > Blog > Features > What Is Monkeypox And Why Is It spreading?
FeaturesHealth

What Is Monkeypox And Why Is It spreading?

Last updated: 2022/08/02 at 1:26 PM
3 years ago
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The first thing everyone should know about monkeypox is that it actually has very little to do with monkeys.

“It was first discovered in monkeys in a laboratory setting in central Africa, it does infect monkeys and has been isolated from monkeys, but they’re not the primary reservoir for the disease,” says Sagan Friant, an anthropologist at Pennsylvania State University in the United States. “We think of a reservoir as an animal that can transmit the disease but does not suffer or die from it.”

Friant has been studying monkeypox in Nigeria for more than 15 years and was about to begin a new research project just as the Covid-19 pandemic hit. She says it’s likely – but not yet proven – that the monkeypox virus originates in rodents.

“For a long time, scientists thought that diseases in primates were the most threatening to humans because of our close similarity genetically, and that’s true,” she says. “But we’re realising that infectious diseases from rodents and bats are of increasing importance when we’re thinking about spill-over of new diseases into human populations.”

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Infections that pass from animals to humans are known as zoonotic diseases. Some of these also have the ability to pass from human to human once they make the jump across species.

In that respect, monkeypox has some similarities to Covid-19. But it’s been around a lot longer than the coronavirus behind the recent pandemic.

Where did monkeypox come from?

Monkeypox was first identified in 1958 at a laboratory in Copenhagen, Demark when it was discovered in monkeys that had been imported from Singapore a couple of months earlier. The first case in humans was not reported until 1970 when a nine-month-old boy admitted to a hospital in the Democratic Republic of Congo was found to have been infected with the virus. Although the young patient lived in an area of tropical rainforest populated by monkeys, doctors were not able to establish if he had recently come into contact with an infected monkey or if it had come from another source. The boy recovered from the infection, but sadly contracted measles a few days later and died.

While it is likely there were human cases before this where the virus was not identified – it causes lesions that are similar to those seen in other pox infections such as smallpox – there have since been cases in a number of African countries before the first outbreak in the US in 2003 when 70 cases were reported. It is thought on that occasion the virus was brought to the US in infected prairie dogs. They had been kept as pets and housed with Gambian pouched rats and dormice that were imported from Ghana. Other cases – usually in people who had recently travelled to African countries – have been seen in the UK, Israel and Singapore.

But since May 2022 there has been a spate of outbreaks reported in the US, UK, Australia, mainland Europe, and Canada. While this has worried health authorities and scientists, the number of infections in these outbreaks is a fraction of those seen in Africa, where the disease is endemic.

Exactly where this latest set of outbreaks originated is still something of a medical detective story. Genetic analysis has revealed that the variant of the virus causing the outbreaks belongs to a branch of the monkeypox evolutionary tree that initially appeared in West Africa, but no clear link to any countries where the virus is endemic has been found. Instead, there is now the suspicion among health experts that the virus might have been circulating undetected in human populations in a number of countries outside Africa for several months, if not longer.

Some genetic analysis – although still preliminary and yet to be peer-reviewed – has indicated that it could have been as early as 2017 that the West African monkeypox virus picked up the ability to spread from human to human. And since then it has accumulated a high number of mutations that have made it better able to infect and pass between human hosts – including one that may help it to inhibit some of our immune defences.

How does monkeypox spread?

Unlike the virus that causes Covid-19, which primarily spreads through tiny droplets expelled as we breathe and is highly infectious, monkeypox is not as readily transmissible. It instead relies on close physical contact – usually prolonged – to pass from person to person, or animal to person.

“It could be contacted with someone who has an infectious rash, such as lesions, scabs and bodily fluids,” says Madeline Barron, from the American Society for Microbiology (ASM). “You can also get it by touching items that someone who’s infected may have touched.”

A study published in the New England Journal of Medicine found that between April and June 2022, 98% of the infections in 16 countries were in men who have sex with men, but it’s not clear why this is the case. It could just be a coincidence – once a disease is introduced to a community, it tends to spread within that community. And there is no evidence that monkeypox passes any quicker through a population of men who have sex with men than any other group. Nor is there any evidence that it is more infectious to men than to women.

“We don’t know if the virus can spread specifically through sexual transmission routes, such as through vaginal secretions or semen, but it seems to be that intimate contact is promoting the spread,” says Barron.

Although DNA from the monkeypox virus has been detected in semen by researchers, it does not necessarily mean that this is how it is spreading. The monkeypox virus is a packet of genetic information encased in an envelope of proteins and a membrane. It requires all these components to be in working order if it is to infect cells, and although viral DNA can be detected in semen, the virus itself may not be viable and capable of infection.

How dangerous is monkeypox?

Another important thing you need to know about monkeypox is that it is deeply unpleasant. The mortality rate of the current strain is around 1% and, at the time of writing, there have been three deaths reported in the outbreaks outside Africa, and five deaths in African countries where the disease is endemic, since the start of the year.

Compared to the Central African strain of the monkeypox virus, the West African version is generally associated with milder disease and fewer deaths.

But even if the chances of dying are relatively low, patients with monkeypox have reported how painful and debilitating it is.

“It’s long, it’s nasty and you don’t want to get it,” says Barron. “People will feel flu-like symptoms in the beginning, with fever, headache, stuff like that, but as the disease progresses you get a multi-stage rash, lesions can develop in your mouth, your feet and genital region and these develop into pus-filled blisters.”

Monkeypox lesions or blisters tend last a few weeks after appearing but can leave long-lasting and even permanent scarring behind (Credit: Yuki Iwamura/AFP/Getty Images)

Monkeypox lesions or blisters tend last a few weeks after appearing but can leave long-lasting and even permanent scarring behind (Credit: Yuki Iwamura/AFP/Getty Images)

It can take between five and 21 days from infection before symptoms start, although typically this incubation period is 6-13 days. Initially, it begins with headaches, fever, muscle aches and fatigue for the first few days. One distinguishing feature of the virus is swelling of the lymph nodes. Eruptions on the skin tend to appear within a couple of days of the fever appearing.

Some three to four weeks after infection, the blisters will eventually scab over and fall off. Scarring, however, is common in people who recover. There is no specific treatment, other than medicines to treat the symptoms, and, like most diseases, your chances of getting seriously ill or dying depend on factors such as your age and level of immunity.

What perhaps makes monkeypox so shocking is that the symptoms look similar to a disease of the past. One that we thought we had seen the back of thanks to a successful global vaccination campaign: smallpox. Monkeypox is from the same group of viruses as smallpox, although a distinct virus. (Read more about the mysterious virus that helped us eradicate smallpox.)

Is monkeypox evolving?

Monkeypox is a brick-shaped virus carrying a double-strand of DNA. This is good news because it means the virus is relatively stable and less likely to mutate into more lethal or more transmissible variants. The Sars-CoV-2 virus that causes Covid-19 contains genetic material made from a single-stranded RNA.

“RNA viruses mutate very effectively ­– they’re diabolical, in my opinion, they’re just really nasty viruses,” says Rodney Rohde, a professor at Texas State University with a background in public health and virology. He is the co-author, with Barron, of a recent publication for the American Society of Microbiology on the current state of knowledge about monkeypox. “DNA viruses typically don’t mutate that quickly, even with the 50 mutations we’ve seen (in monkeypox), so we don’t see mutations having an impact on the severity of the disease.”

Monkeypox virus has mainly been found in a few African countries, but this year started spreading more globally (Credit: Melina Mara/The Washington Post/Getty Images)

Monkeypox virus has mainly been found in a few African countries, but this year started spreading more globally (Credit: Melina Mara/The Washington Post/Getty Images)

Part of the reason for this may be because more than half of the mutations seen in the virus over the past four years are considered to be “silent” – meaning they don’t change any of the viral proteins it needs to infect cells and evade the immune system. Even so, some researchers have expressed surprise at how many mutations the virus has accumulated in the past three or four years. Researchers have also identified two distinct lineages of the virus – suggesting separate sources – spreading in the US.

Preliminary unpublished research has also identified potential mutations that have yet to be seen in the virus but could alter how pathogenic the disease becomes if they were to occur in the future. But this work, if shown to be correct, could also help health officials and scientists look out for signs monkeypox is evolving into something more worrisome.

Why is monkeypox now a global health emergency?

The World Health Organization now considers monkey to be a global health emergency. Why this is may also relate to smallpox.

For almost 200 years, we had been routinely vaccinating people against smallpox. Today, thanks to a global scientific effort, smallpox is the only human disease we have wiped off the face of the Earth, and the world was declared smallpox-free on 8 May 1980. Although the smallpox virus still exists in secure laboratories, it is no longer a transmissible disease. But neither do we now have any natural immunity to smallpox or similar viruses. And with the end of the smallpox vaccination campaign in the mid-1980s, so too has the protection if offered against other pox viruses waned.

“We probably had a pretty strong herd immunity across the globe when we eradicated smallpox,” says Rohde. “There’s some research that shows that if you go back and look at the population in Nigeria, for example, they probably would have spread monkeypox more efficiently had they not been vaccinated against smallpox.

“Once we stopped smallpox vaccinations, we had waning antibodies – my parents, for example, may have some immunity, but it’s probably really poor.”

How effective are the vaccines?

The good news is that vaccines developed for smallpox are effective against monkeypox – perhaps up to 85% effective. And, even though there have been recent moves to destroy stockpiles of smallpox vaccines around the world, countries have been replenishing their supplies. Mostly, however, this has occurred in wealthy nations. And that’s perhaps the most dispiriting aspect of this most recent monkeypox outbreak. We have known about the disease for more than 50 years but only when it spread to North America and Europe did governments outside Africa appear to take any notice.

Data from the Africa Centres for Disease Control and Prevention shows that, since 2020, there have been some 12,500 (reported) monkeypox cases across the continent, with at least 365 deaths.

Infected prairie dogs housed with animals imported from Ghana were thought to be the source of an outbreak in the US 2003 (Credit: Mike Roemer/Getty Images)

Infected prairie dogs housed with animals imported from Ghana were thought to be the source of an outbreak in the US 2003 (Credit: Mike Roemer/Getty Images)

“Many of us have been screaming about these types of issues for decades,” says Rohde. “In my opinion, we don’t always think about these things when they’re not on our shores.”

“Those regions where it is endemic, and it’s been a prolonged issue, are still at the short end of the stick in terms of getting the resources, the diagnostics, the vaccines, everything needed to handle the outbreak,” adds Barron. “If Covid has taught us anything it’s that the world is small and you need a coordinated effort to respond to diseases because diseases don’t know boundaries.”

A 2020 United Nations report warned of the growing risk of new diseases passing from animals to humans, exacerbated by our encroachment on natural habitats and the effects of climate change. The bottom line for Friant, who specialises in the health consequences of the interaction between humans and animals, is that we need better monitoring of all potential zoonotic diseases.

“We need more investment in understanding the diseases and preventing that initial spill-over event from animals to humans from happening,” she says. “We also need collaboration and capacity building in countries so that they’re equipped to respond to these events – it definitely shouldn’t just be about protecting the Western world.”

Like Covid-19, monkeypox is just the latest disease to spread from animals to the human population. Given its relatively slow spread and the fact that vaccines are available to prevent infection, it’s likely this current monkeypox outbreak will be contained. But monkeypox won’t be the last disease of this nature. And the world will need to be ready and vigilant for the next.

Source: BBC

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