help for key workers living with long covid. and a nail biting day for nasa as it aims to land its perseverance rocket on the surface of mars. good afternoon and welcome to bbc news. there s been a marked decline in levels of coronavirus infections in england since january, say scientists tracking the epidemic. a study by imperial college london found that infections have fallen by two thirds across england since the latest lockdown began, with an 80% fall in the capital itself. but it warns that levels are still high, particularly among primary school age children and young adults, with one in 200 testing positive between the 4th and 13th february. that s similar to levels seen in september. katharine da costa has the details. friends and family kept apart. many businesses kept on hold. lockdown has taken its toll on all of us, but researchers say it has helped to take infection levels in england down to those last seen in september. imperial college s react survey looked at