Health authorities in the Australian state of New South Wales (NSW) have issued a measles alert for central Sydney and the city's airport.NSW Health said on Thursday that it has been notified that a confirmed measles case from the neighboring state of Queensland visited several Sydney locations while infectious between Nov. 8 to 10, including a concert attended by around 70,000 people.Anyone who visited a list of locations including the Sydney Airport, central business district, the concert and trains in the city's inner-west between Nov. 8 to 10 has been advised to monitor for measles symptoms until Nov. 28.Jeremy McAnulty,...