A storm is brewing in the Democratic Republic of CongoA country in central Africa with a population of 99 million. (DRC). Mpox - a contagious disease spread by human contact - is spreading more rapidly than ever before.

There have been more than 17,500 recorded cases in Africa so far this year, more than all of 2023. The virus has moved from the DRC to 12 neighbouring countries.¹ On Thursday evening, Sweden announced the first case of the new variant outside of Africa.

On Tuesday, the World Health OrganisationThe United Nations agency responsible for global public health. (WHO) declared mpox a public health emergency.

WHO outbreak leader Maria Van Kerkhove said: "The time [to act] is now." We must defeat the disease before it spreads further.

Mpox is closely related to smallpoxA disease estimated to have killed 300 million people in the 20th Century..² It has flu-like symptoms. But its most notable outward sign is a skin rash. Some sufferers develop sores over their whole body. A human case was first recorded in 1970 in the DRC.

Most patients recover. But it can prove fatal. There have been 460 recorded deaths this year so far in Africa.

Doctors believe this spread is due to Clade 1b, a mutantAn organism that is different to others in the same species due to genetic changes. variant that can spread through short contact, especially among young children.

All infectious diseases come from an interaction between our bodies and the environment. The plagueA deadly disease that spreads between people. was spread by a bacteriaA large group of single-cell microorganisms. Some cause disease in animals and humans. that lives in fleas, which themselves live on rodents.³ MedievalRelating to the Middle Ages. Europe's rat-ridden cities provided the perfect breeding ground.

Many scientists believe that our changing planet is making disease worse. Environmental activists have begun to use the term One Health to describe the connectedness between humans, other living things and the planet. Our actions affect other beings and they affect us.

Warmer winters and longer summers are causing insect-based diseases to flourishGrow or develop in a healthy or vigorous way.. Ticks, which spread Lyme diseaseAll illness caused by bacteria-carrying tick bites., have begun to spread further north and be active over a longer period of time.

Changes in rain patterns and water temperature can affect the spread of waterborne diseases such as E. coli, which has recently been spotted in London and Paris.

Others think that the connection is less clear. Climate change is complex and connected to many other processes. It is hard to find just one cause for an outbreak.

Is our abuse of the planet to blame?

Yes: We reap what we sow. As temperatures rise, summers extend and forests fall, infectious diseases crop up in newly warmer locations. The links are obvious. To ignore it is a form of climate change denial.

No: Disease featured in human history long before global warming and will exist after we are gone. Climate change offers a convenient excuse for some outbreaks. But the true picture is even darker. Sickness is always with us.

Or... Blame is a strong word. There is almost certainly a relationship between our changing environment and the spread of illness. But the illnesses are often unwanted side effects of things done to improve lives. And cause and effect are rarely clear.

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