lockdown after coronavirus cases trebled in just a week. Infection rates in the city have rocketed from 4.1 cases per 100,000 last week to 13.3 yesterday, the Sun reported.The huge spike has fuelled warnings that another lockdown will be reimposed.Boris has already made it clear that authorities will be quick to bring in so called “local lockdowns”.Parts of Manchester and Yorkshire are already under restrictions again – with households not able to meet up indoors.Council chiefs in Leeds have urged residents to follow social distancing measures in a desperate attempt to curb the spread.But the council admitted further steps may be needed.A statement said: “Measures will be continually monitored over the coming days and further steps may need.