Also, in the thread, somebody says the lock hospital was a hospital in London. There was a lock hospital in London, but the term is generic; lock hospitals were estabished in various places (in the British Isles and round the world) before and then mainly in the second half of the 19th century. Many hospitals would not take patients with infectious diseases, and funds had to be raised via charity for specific provision.

You will find lots of info if you google: here is a link to an article which looks reasonably well researched.

https://pdfs.semanticscholar.org/7740/7b24f96500b0be98b8c926324eb1d45ad9a7.pdf