The Holy Loch quarantaine station in the Firth of Clyde was established for ships bound to the western ports of Scotland, comprehending the ports of Glasgow, Greenock, Irvine, Campbeltown, Oban, Rothsay, Fort William, Ayr, Port Patrick, Stranrear and Wigtown.
An article on the history of the Lazaretto can be found on the website of "Historic Kilmun": http://www.historickilmun.org/stories/lazaretto
Letter from Alex Gordon of the Leith Custom House (dated April 9th, 1829) to Henry Davidson regarding the ground plan of the lazaretto at Holy Loch.