In medical universities a lot - in Plovdiv I think they are around 50%. In other universities, no more than 5% maybe.
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The most noticeable ethnic enclaves in Sydney have a high concentration of Asians; Chinese, Indian, Korean, Filipino, Vietnamese and Nepali people, but when I was growing up there were hardly any Asian people here. I’ve not really seen any true ethnic enclaves where one ethnicity is the overwhelming majority, the closest is maybe one suburb that is around 50-60% Chinese but there is still some diversity there.
There are of course majority Anglo-Australia areas of the city, which aren’t described as ethnic enclaves or ghettos and in the past there were areas with higher concentrations of Italians and Greeks, now a lot of those people have moved out of those areas, so I think these ethnic communities tend to break down over time.
I think ‘ghetto’ is the wrong way to describe some of these communities because it has a negative connotation where you’d assume these areas are dangerous with a high crime rate and low income, but that isn’t necessarily true for all ethnic enclaves. In Sydney there are some areas with a large Lebanese communities and they kinda have a bad reputation for being rough areas, so maybe they could fit into the definition of a ‘ghetto’.
A doctor who has treated me in the past studied at the Medical School in Sofia - as it happens, he is English but of partial Iranian descent. (In the UK nowadays, fully one third of doctors now are foreign-born and 40-50% are nonwhite - in both cases principally of South Asian origin).