Mancunians have been told their partying has to be put on hold as the city’s Covid infection rate rose almost to the government’s red alert threshold.Latest figures show Manchester recording 49 cases per 100,000, just below the 50 mark that would push it into the government’s riskiest category.The city’s rate has more than tripled in a month.Its leaders have now warned that house parties - which are believed to partly be behind the rise - and other inside gatherings must stop, or else Manchester