Why did disease spread so easily in industrial revolution cities

In the overcrowded tenements of the industrial cities, one infected person could spread the disease very easily. Though accurate records are difficult to acquire, it is believed that TB killed one-third of all those who died in Britain between 1800 and 1850. Microbes were only discovered in 1864 by Louis Pasteur.

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because there were many people and there were some among them that had deseases and they kept spreading

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the process of industrialization is called a revolution because

during the middle ages bibles and most christian literature was written in latin i think that’s the answer you are looking for