Dr. Barry, who was one of the most acclaimed physicians of the time, claimed that British people of "a better sort" contracted tuberculosis because they tended to imbibe liquor and eat a lot of meat. He deduced that they could therefore combat the disease through a diet of milk and vegetables. Eating vegetables is never a bad idea. Neither is drinking milk instead of brandy or claret or whatever else eighteenth-century British aristocrats were downing.
Seeing as how the milk would have been unpasteurized, drinking brandy or claret probably would have been a better idea. If you want to get technical, drinking watered down brandy or claret would probably have been best, but still. You just need enough alcohol to kill any bacteria in the water.
Yes, I'm still at it. I will give Wright some points for coming down against anti-vaxxers, but that's a pretty low bar.