Spate of incidents involving sharks across Sydney and New South Wales have rattled even the most seasoned surfers and beachgoersFollow our Australia news live blog for latest updatesGet our breaking news email, free app or daily news podcastIn a city of more than 100 beaches, swimming and surfing are part of Sydney’s lifeblood. But four shark bites in New South Wales in 48 hours – three of which were in Sydney – have rattled even some of the city’s most seasoned ocean users.On Sunday afternoon, a 12-year-old boy was left fighting for his life after being bitten on a harbour beach in Vaucluse in Sydney’s east. On Monday morning, an 11-year-old’s surfboard was bitten multiple times at Dee Why in the city’s north, while that afternoon, a 27-year-old man was bitten while surfing in Manly, less than 5km away.