BERLIN : German hospitals warned of staff shortages on Friday, saying the sharp rise in new coronavirus infections also meant medics, nurses and support staff were getting sick or needing to isolate, leading to strains in providing care for patients.Germany, which has managed to keep the number of cases and deaths lower than many of its neighbours, is now seeing the biggest jumps in new infections since April, with more than 4,000 on both Thursday and Friday.At the Frankfurt university hospital, twice as many employees caught the virus in the past two weeks as in the three months before, its medical director Juergen Graf said at a news conference in Berlin."This will be the bottleneck in the care supply," he said.The internal problems were.