Smallpox is often remembered as one of history’s most devastating diseases. Thanks to a global vaccination campaign, the World Health Organization (WHO) officially declared it eradicated in 1980, making it the only human disease to be completely eliminated through vaccination.

Even though smallpox no longer spreads naturally, researchers continue to study the virus and its history. Scientists have found traces of viral genetic material in well-preserved historical remains, including mummies and bodies preserved in frozen environments. These discoveries have prompted ongoing research into how long viral material can persist after death, although finding genetic material does not necessarily mean an infectious virus is still present.

Interest in the topic has also grown as climate change exposes ancient burial sites in regions with melting permafrost. In the past, thawing ground has released other dormant microorganisms, leading scientists to carefully monitor similar situations. However, experts note that there is no evidence that smallpox has re-emerged from frozen remains.

One challenge with smallpox was that its early symptoms could resemble other illnesses before its distinctive rash developed. As the disease progressed, it produced fluid-filled sores that eventually formed scabs. Historical records and preserved remains have helped researchers better understand how the disease affected people throughout history.

Evidence suggests smallpox existed for thousands of years, with signs of the disease identified in ancient human remains. Before vaccination became available, it claimed millions of lives worldwide and had a profound impact on human history.

Today, smallpox remains eradicated, and scientists continue studying the virus to improve public health preparedness and deepen our understanding of infectious diseases. Ongoing research helps ensure that lessons learned from the past continue to inform modern medicine and global disease prevention efforts.