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The british chambers of commerce are calling for free or low—cost covid—19 testing kits to be given to companies to help them cope with the large numbers of staff catching the virus. the business group says as many as three—quarters of employers reported workers off sick with coronavirus in the last four weeks. covid cases peaked last month, with about 5 million people infected at the end of march. but now the onus is on companies to try to keep staff safe. our consumer affairs correspondent colletta smith reports from liverpool. business has been booming here for the last couple of year...

It's easy to talk about a perfect storm, but it seems to be at you have got two problems. one is input prices going up, supply chain disruption. at the same time, consumers are saying they have less money in their pockets and are just not going to go out and buy. taken together, that can have a huge knock—on effect, can't it? we normally talk about inflation as a way of dampening down the overheated economy. but actually that effect is mimicked and amplified if you look at what's happening to energy prices. if you have already having money from your disposable income to pay for higher energy...

An international team of researchers has developed new smartphone-powered tests for dengue fever that has significantly improved rates over lateral flow testing kits.

Confusion here. what kind of test is best to know if you're still contagious after that five-day period? >> good evening, david. thanks for having me back. the first five days after you test positive is the most important to isolate. that's when people are most contagious. the test that's useful after five days is one of those rapid antigen tests and what we know is that it's a very good test for picking up contagiousness and if you have two of those that are negative, very, very good information that you're not contagious anymore. >> again on that cdc language, they say if you choose to test,...

>> reporter: the cdc cutting the recommended quarantine time in half for all americans infected with covid-19, from ten to five days, if they're asymptomatic for five days. by 5:00 in the morning, lines of south florida were forming with prospects of free covid testing kits luring thousands. >> empty shelves everywhere. >> they're all in stock. they're all fine, but i guess they all disappeared in a matter of three days. like they just weren't there. >> reporter: at this library in miami-dade county, you're looking at two different lines right now. this is for free testing kits. this one is fo...