Vaccines alone won’t be enough to fight Covid-19, Novartis AG Chief Executive Officer Vas Narasimhan said. Treatments will also play a crucial role.Significant supplies of highly effective vaccines probably won’t be available until the end of next year, according to Narasimhan, who headed development for Novartis’s former vaccines unit before it was sold to GlaxoSmithKline Plc five years ago.Even once such a vaccine is on the market, he said, it probably won’t protect everyone – as is the case…