COVID-19 vaccines will be effective against the new fast-spreading variant of the virus that is raging in Britain and are performing tests that should provide confirmation in a few weeks.Ugur Sahin, chief executive of Germany's BioNTech, which with partner Pfizer Inc, took less than a year to get a vaccine approved, said on Tuesday he expects its messenger RNA (mRNA) vaccine to still work well.Also Read | How hunger came back to haunt IndiaModerna Inc, Germany's CureVac and British drugmaker AstraZeneca Plc also believe their shots will work against the new threat that has sown chaos in Britain, prompting a wave of travel bans that are disrupting trade with Europe and threatening to further isolate the island country."Scientifically it is.