If you are of a nervous disposition you might want to look away as a I reel off estimates of Germany’s "R" number: 1.06 on Friday, rising to 1.79 on Saturday and 2.88 on Sunday. The coronavirus reproduction 'R' rate - the average number of people each patient infects - is still hovering around the dreaded level of one in three regions in England. Well, no. Find out more, London in Tier 2 - here's what it means for you, How do the new Covid tier rules affect me? Every infectious disease is given a reproduction number, which is known as R0 - pronounced 'R nought'. Chickenpox's R0 is estimated to be between 10 and 12, while seasonal flu has a value of around 1.5. Widespread vaccination keeps it suppressed in most developed countries. Paradoxically, the abattoir outbreak would have had a lower impact on Germany’s R number had the nationwide incidence of the disease been much higher. Officials in the North Rhine-Westphalia region said they have also seen outbreaks in logistics centres, refugee centres, church communities and after family parties. The country also recorded its highest rise in cases for more than a month on Friday, with 770 people testing positive, taking the total to almost 190,000. That is a closed environment kept at a chilled temperature which seems to have been an ideal place to promote the spread of the virus. What does that look like? It is an approximation of the change in the number of infections each day, and the size of the growth rate indicates the speed of change. Oh, and only one of them showed any symptoms. It is thought to be at least three times more contagious than the coronavirus that causes MERS (0.3 - 0.8). Everything you need to know. But scientists told MailOnline that using the R to assess the UK's crisis is becoming less useful because of falling prevalence of the disease in the community. On Friday the RKI reported Germany's highest daily increase in coronavirus cases in a month when it listed 770 new confirmed cases, taking the country’s total to 188,534. The views expressed in the contents above are those of our users and do not necessarily reflect the views of MailOnline. Britain's 'Covid-alert' level was downgraded on Friday from level four to level three after scientists confirmed that the epidemic is shrinking by four per cent every day. Experts say each should be considered alongside other measures of the spread of disease. By Sam Blanchard Senior Health Reporter For Mailonline, Published: 07:55 EST, 21 June 2020 | Updated: 11:10 EST, 21 June 2020. The Crown's Emma Corrin shares behind the scenes photographs, Joe Biden fractures foot while playing with one of his dogs, Stonehenge tunnel faces legal challenge as campaigners say minister wrongly overruled expert advice, in the grip of a huge second spike of Covid-19. 'No-one will get a handle on the R rate when 80 per cent of people are asymptomatic and the virus is circulating at such low levels. The German government has stuck to its course of gradually reopening the country while seeking to clamp down swiftly on localised outbreaks. The number means simply how many people an average Covid-19 patient will infect - 1.79 means every 10 people infected will pass it on to 18 (17.9) others and the outbreak will continue to grow. Given that an "R" of more than one is supposed to indicate an epidemic that is growing, Germany is – on this measure at least – in the grip of a huge second spike of Covid-19. Think a mid-sized town like Bath, Worcester or Rochdale and imagine that four people caught the virus last week. The R0 value for SARS-CoV-2, the virus that causes COVID-19, was estimated by the Imperial College COVID-19 Response Team to be 2.4 in the UK before lockdown started. 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