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Thursday, December 01, 2022

Climate change has a direct impact on diseases, which are becoming increasingly serious and numerous.

Global warming has increased more than 200 infectious diseases.


  • Heat waves, droughts, floods, hurricanes and fires reduce people’s immunity against dozens of pathogens


  • Consequences of global warming linked to virus outlook


  • Study authors warn that “aggressive” action must be taken urgently to reduce greenhouse gas emissions

This climate change affects people’s health about which science has been warning for decades. What he does now is measure the magnitude of the impact. 218 (58%) of 375 infectious diseases affecting humans Climate threats are on the rise. This number rises to 277 when non-communicable diseases are included., such as asthma, insect bites, or venomous snake bites. This is the conclusion of a detailed study led by Professor Camillo Mora of the Department of Geography and Environment at the University of Hawaii (United States).

The study, published by Nature Climate Change, uses the presence of the SARS-CoV-2 and COVID-19 pandemics as an example to argue how Climate change favors transmission of a large number of pathogenic diseasesThis reflects an “urgent need to take aggressive action to reduce greenhouse gas emissions,” the scientific report said.

Fewer defenses and more serious infections

Global warming has increased more than 200 infectious diseases and other episodes such as venomous stings or bites. Climate threats bring humans and pathogens closer together, that the infections are more severe and that people have less defenseWhich leads to an increase in diseases and their severity.

las high temperatureFor example, increased survival and bite rates of mosquitoes carrying viruses such as West Nile. In addition, heat waves cause a rise in cases of waterborne diseases such as gastroenteritis.

las Hurricanes, sea level rise and floods They force people to carry and drink unsafe water, leading to Lassa fever, cholera or typhoid infection. Diseases that can be more severe given the loss of immunity, malnutrition and mental stress.

warm winter-surviving pathogens

What were the changes in heat and rainfall associated with? Expansion of disease transmission vectors such as mosquitoes, ticks, fleas, birds and various mammals Viruses, bacteria, and protozoa outbreaks include, but are not limited to: dengue, chikungunya, plague, Lyme disease, West Nile virus, Zika, or malaria.

Climate-driven expansions were also observed in aquatic systems, including cases of Vibrio species (eg, cholera), anisakiasis, and jellyfish poisoning. Warming at high latitudes allowed vectors and pathogens to survive winterWhich increased the outbreak of various viruses like Zika or Dengue.

People and viruses, closer and closer

Habitat changes due to warming, drought, heat waves, wildfires, hurricanes, floods and land cover changes were also associated with bringing pathogens closer to people. Side effects of viruses such as Nipah or Ebola have been associated with wildlife: Bats, rodents, and primates that migrate over large areas in search of food resources Drought after wildfire or limited by finding new habitat.

Drought also caused congregation Mosquitoes and birds around the rest of the water sources, which facilitate the transmission of West Nile virus. flood and storm They were usually associated with sewage overflow, leading to direct and food-borne transmission of norovirus, hantavirus or hepatitis.

“Pandora’s Box” of Pathogens Frozen in Time

Warming has also been linked to melting of ice and permafrost, which once frozen exposed pathogens. For example, Genetic analysis of anthrax outbreak in the Arctic Circle suggests bacterial strain may have been ancient And when the frozen ground melted, came out of the carcass of an animal. The successful emergence of time-frozen pathogens can be considered a “Pandora’s Box”, given the potentially large number of pathogens that accumulate over time and these pathogens may be new to people.

Despite the magnitude of the study and the high number of quantifiable diseases, there are scientists who believe that Professor Mora and his team’s figures are low, they say, especially taking into account aspects that have not been given importance, such as: That Impact of environmental conditions on access to health care or food security, In fact, according to Georgetown University biologist Colin Carlson, “there is no part of global health that climate change is not changing.”

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