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Over 15,000 people died of cholera in Mecca in 1846.[7] In Russia, between 1847 and 1851, more than one million people died in the country's epidemic.[8]

A two-year outbreak began in England and Wales in 1848, and claimed 52,000 lives.[9] In London, it was the worst outbreak in the city's history, claiming 14,137 lives, over twice as many as the 1832 outbreak. Cholera hit Ireland in 1849 and killed many of the Irish Famine survivors, already weakened by starvation and fever.[10] In 1849, cholera claimed 5,308 lives in the major port city of Liverpool, England, an embarkation point for immigrants to North America, and 1,834 in Hull, England.[11

Over 15,000 people died of cholera in Mecca in 1846.[7] In Russia, between 1847 and 1851, more than one million people died in the country's epidemic.[8]

A two-year outbreak began in England and Wales in 1848, and claimed 52,000 lives.[9] In London, it was the worst outbreak in the city's history, claiming 14,137 lives, over twice as many as the 1832 outbreak. Cholera hit Ireland in 1849 and kill

A two-year outbreak began in England and Wales in 1848, and claimed 52,000 lives.[9] In London, it was the worst outbreak in the city's history, claiming 14,137 lives, over twice as many as the 1832 outbreak. Cholera hit Ireland in 1849 and killed many of the Irish Famine survivors, already weakened by starvation and fever.[10] In 1849, cholera claimed 5,308 lives in the major port city of Liverpool, England, an embarkation point for immigrants to North America, and 1,834 in Hull, England.[11] In 1849, a second major outbreak occurred in Paris.

Cholera, believed spread from Irish immigrant ship(s) from England to the United States, spread throughout the Mississippi river system, killing over 4,500 in St. Louis[11] and over 3,000 in New Orleans.[11] Thousands died in New York, a major destination for Irish immigrants.[11] The outbreak that struck Nashville in 1849–1850 took the life of former U.S. President James K. Polk. During the California Gold Rush, cholera was transmitted along the California, Mormon and Oregon Trails as 6,000 to 12,000[12] are believed to have died on their way to Utah and Oregon in the cholera years of 1849–1855.[11] It is believed cholera claimed more than 150,000 victims in the United States during the two pandemics between 1832 and 1849,[13][14] and also claimed 200,000 victims in Mexico.[15]

The cholera epidemic in Russia that started in 1847 would last until 1851, killing over one million people. In 1851, a ship coming from Cuba carried the disease to Gran Canaria.[16] It is considered that more than 6,000 people died in the island during summer,[17] out of a population of 58,000.

In 1852, cholera spread east to Indonesia, and later was carried to China and Japan in 1854. The Philippines were infected in 1858 and Korea in 1859. In 1859, an outbreak in Bengal contributed to transmission of the disease by travelers and troops to Iran, In 1852, cholera spread east to Indonesia, and later was carried to China and Japan in 1854. The Philippines were infected in 1858 and Korea in 1859. In 1859, an outbreak in Bengal contributed to transmission of the disease by travelers and troops to Iran, Iraq, Arabia and Russia.[7] Japan suffered at least seven major outbreaks of cholera between 1858 and 1902. Between 100,000 and 200,000 people died of cholera in Tokyo in an outbreak in 1858–60.[18]

In 1854, an outbreak of cholera in Chicago took the lives of 5.5 percent of the population (about 3,500 people).[19][20] Providence, Rhode Island suffered an outbreak so widespread that for the next thirty years, 1854 was known there as "The Year of Cholera."[21] In 1853–54, London's epidemic claimed 10,739 lives. In Spain, over 236,000 died of cholera in the epidemic of 1854–55.[22] The disease reached South America in 1854 and 1855, with victims in Venezuela and Brazil.[15] During the third pandemic, Tunisia, which had not been affected by the two previous pandemics, thought Europeans had brought the disease. They blamed their sanitation practices. Some United States scientists began to believe that cholera was somehow associated with African Americans, as the disease was prevalent in the South in areas of black populations. Current researchers note their populations were underserved in terms of sanitation infrastructure, and health care, and they lived near the waterways by which travelers and ships carried the disease.[23]

The 1854 Broad Street cholera outbreak was a severe outbreak of cholera that occurred in 1854 near Broad Street (now Broadwick Street) in the Soho district of London, England, and occurred during the third cholera pandemic. This outbreak, which killed 616 people, is best known for the physician John Snow's study of its causes and his hypothesis that germ-contaminated water was the source of cholera, rather than particles in the air (referred to as "miasma").[24][25]

Snow identified the source of an 1854 cholera outbreak as the public water pump on Broad Street (now Broadwick Street). Although his studies were not entirely conclusive, his advocacy convinced the local council to disable the Broad Street pump by removing its handle. Snow later used a dot map to illustrate the cluster of cholera cases around the pump. He also used statistics to illustrate the connection between the quality of the water source and cholera cases, showing that water was being delivered to the outbreak area from sewage-polluted sections of the Thames, leading to an increased incidence of cholera. Snow's study was a major event in the history of public health and geography. It is regarded as one of the founding events of the science of epidemiology.

This discovery came to influence public health and the construction of improved sanitation facilities beginning in the mid-19th century. Later, the term "focus of infection" would be used to describe sites, such as the Broad Street pump, in which conditions are good for transmission of an infection. John Snow's endeavor to find the cause of the

Snow identified the source of an 1854 cholera outbreak as the public water pump on Broad Street (now Broadwick Street). Although his studies were not entirely conclusive, his advocacy convinced the local council to disable the Broad Street pump by removing its handle. Snow later used a dot map to illustrate the cluster of cholera cases around the pump. He also used statistics to illustrate the connection between the quality of the water source and cholera cases, showing that water was being delivered to the outbreak area from sewage-polluted sections of the Thames, leading to an increased incidence of cholera. Snow's study was a major event in the history of public health and geography. It is regarded as one of the founding events of the science of epidemiology.

This discovery came to influence public health and the construction of improved sanitation facilities beginning in the mid-19th century. Later, the term "focus of infection" would be used to describe sites, such as the Broad Street pump, in which conditions are good for transmission of an infection. John Snow's endeavor to find the cause of the transmission of cholera caused him to unknowingly create a double-blind experiment.