The initial wave of the Black Death tore through Europe from 1347 to 1352, roughly five years of devastating mortality. But that first outbreak was only the beginning. Plague returned in recurring epidemics for centuries afterward, forming what historians call the Second Plague Pandemic, which lasted from the 14th century all the way into the 19th century.
The First Wave: 1347 to 1352
The Black Death arrived in Europe in 1347, when ships carried the disease from Asia Minor to the Crimea, then to Constantinople, and across the Mediterranean to Messina, Sicily. From there it moved fast. By 1348, plague had reached Marseille, Paris, and Germany. Spain, England, and Norway followed in 1349, and eastern Europe by 1350. Within five years, the disease had swept across virtually the entire continent.
The death toll was staggering. Older estimates placed mortality at 25 to 33 percent of Western Europe’s population, but research since 2004, based on records like manorial tenant turnover, points to a figure closer to 50 percent. The population of Western Europe essentially halved in the span of a few years. Eastern Europe, the Middle East, and North Africa likely experienced similar, if slightly lower, losses.
Where It Started
Genomic research has traced the Black Death’s source strain to Central Asia, near Lake Issyk Kul in what is now Kyrgyzstan. A team studying ancient plague DNA from burial sites in the region found that the strain dates to 1338, about a decade before the disease reached Europe. Modern plague strains most closely related to that ancient ancestor still circulate in rodent populations around the Tian Shan mountains, very close to where the original strain was found.
The bacterium responsible, Yersinia pestis, cycles naturally through rodent populations and their fleas. When outbreaks kill large numbers of rodents, infected fleas seek new hosts, including humans. This flea-to-human transmission drove the explosive spread of the Black Death once it reached densely populated trade routes and port cities.
Centuries of Recurring Outbreaks
The 1347 to 1352 pandemic was catastrophic, but plague didn’t simply vanish afterward. A major second epidemic struck in 1361, and outbreaks continued to flare across Europe for the next three hundred years. London alone experienced 18 plague epidemics between 1563 and 1666, culminating in the Great Plague of 1665 to 1666. After that final major outbreak, only a handful of plague deaths were recorded in London, with the very last in 1679.
Taken together, historians classify all of these outbreaks as the Second Plague Pandemic, spanning from the 14th century to the 19th century. The pattern was consistent: plague would subside for years or even decades, then resurge when conditions allowed the bacteria to spill from its rodent reservoirs back into human populations. Each return was smaller than the Black Death itself, but the cumulative toll over centuries was enormous.
How Quickly It Killed
On an individual level, the Black Death moved terrifyingly fast. The most common form, bubonic plague, had an incubation period of 2 to 8 days. Victims developed swollen, painful lymph nodes (the “buboes” that gave the disease its name), along with fever and chills. The pneumonic form, which attacked the lungs and spread through coughing, could develop symptoms within a single day of exposure. Without treatment, death often followed within days of the first symptoms appearing.
This rapid progression helped the disease tear through communities before anyone understood what was happening or how to stop it. By the time a city recognized plague was present, the chain of transmission was already well established.
How Long Recovery Took
Even after the initial wave burned out by 1352, the social and economic aftershocks lasted decades. In England, some historians argue that the economy settled into a new equilibrium by the mid-1370s, roughly 25 years after the worst of the dying. Others place the true stabilization point later, in the 1390s, nearly half a century after the pandemic’s peak. The population losses were so severe that labor shortages transformed wages, land ownership, and social structures for generations.
Europe’s population did not return to its pre-1347 levels until well into the 16th century, more than 150 years later. The demographic hole left by the Black Death was simply too deep to fill quickly, especially with plague returning every decade or two to cull the recovering population.
The Third Pandemic and Final Chapter
Plague emerged once more in the 19th century. The Third Pandemic began in China’s Yunnan province in 1855, reached Hong Kong in 1894, and spread by steamship to ports on every continent by 1900. This final global pandemic waxed and waned for decades before officially ending in 1959. It was during this outbreak that scientists finally identified the bacterium responsible and understood the role of rats and fleas in transmission.
Today, plague still exists in wild rodent populations in parts of Central Asia, Africa, and the western United States. Small numbers of human cases occur each year, but modern antibiotics make the disease treatable when caught early. The bacterium that halved Europe’s population in five years now causes fewer than a few thousand cases worldwide annually.