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The human population seems to face an ebb and flow with pandemics that has restricted existence. While the world was brought to a standstill in the past two years due to the deadly novel coronavirus, now the emergence of newer viruses has raised alarm. 

The global surge of monkeypox cases has forced the World Health Organisation (WHO) to declare the same a pandemic. 

An infectious disease is called emerging when the virus is new on the global register, when its infection agent has changed to become more transmissible or more dangerous or when it is rapidly spreading through new regions.

Does this tell a grim tale of the potential threat that the emerging viruses possess in the 21st century?

Here's a look at all the emerging viruses in the 21st century. 

Covid-19

Covid-19 emerged towards the later half of 2019 in Wuhan city of China. It is caused by a new coronavirus, SARS-CoV-2. The virus has progressed into multiple mutations therefore making it significantly difficult to arrest the spread globally. The virus killed more than 6.2 million people according to a tally to the end of May by the US Johns Hopkins University.

However, the World Health Organization says there have been 14.9 million total global excess deaths associated directly or indirectly with Covid.

The pandemic led to a worldwide mobilisation which brought the swift provision of several largely effective vaccines. 

The WHO said that it is still investigating Covid's origins, but the "strongest evidence is still around zoonotic transmission"—which is when a virus jumps from animals to humans.

MERS

Detected in 2012 in Saudi Arabia, the Middle East Respiratory Syndrome (MERS) is a viral respiratory disease caused by a new coronavirus transmitted via camels.

Although it has a low transmission rate between humans, it causes death in a third of cases. The WHO's last official count published in September 2019 said that more than 850 people have died from MERS.

SARS

Severe acute respiratory syndrome (SARS), also a coronavirus, emerged in southern China in late 2002. It is believed to have been transmitted from bats to humans via a civet—a mammal whose meat is sold in Chinese markets.

SARS causes acute forms of pneumonia and has a mortality rate of 9.5 percent. The outbreak two decades ago spread to around 30 countries, killing 774 people, the bulk of them in China.

Ebola

First identified in 1976 in the Democratic Republic of Congo (then Zaire) the virus, whose natural host is the bat, has since set off series of epidemics in Africa, killing around 15,000 people.

The worst epidemic in West Africa between 2013 and 2016 killed more than 11,300 alone. DR Congo has had more than a dozen epidemics, the deadliest killing 2,280 people in 2020.

Marburg

First identified in 1967 in Germany and the former Yugoslavia after research on imported African green monkeys, the Marburg virus is from the same family as Ebola and leads to the death of around one in two of those infected. The worst outbreak killed 329 people in Angola in 2005.

Zika, chikungunya, dengue

These three viruses produce similar, flu-like symptoms and are transmitted through mosquito bites. Cases exploded in the early 2000s in parallel with a spike in the population of tiger mosquitos.

The zika virus, first discovered in 1947 in a monkey in Uganda, caused its first epidemic in Micronesia in 2007 before exploding in Latin America in 2015, notably in Brazil.

A large danger of the virus is serious deformities in the babies of mothers infected during pregnancy.

Chikungunya spread in Africa from 2004 and reached the Indian Ocean as well as Asia before reaching the Caribbean from 2013 prior to a 2015 outbreak in Latin America. It causes fever and joint pain which generally subside after a few days or sometimes weeks.

Dengue, which primarily occurs in tropical and sub-tropical regions, is often mild, but can be fatal in rare cases.

Cases notified to the WHO rose tenfold between 2000 and 2020 and the disease has become endemic in more than 100 countries in Africa, Latin America, the Eastern Mediterranean, Southeast Asia and the Pacific.

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