A graphic produced by Johns Hopkins researchers shows the number of new infections around the world.

Live version of coronavirus map

The coronavirus may have caught up with the world’s fastest man, sprint king Usain Bolt, who announced Monday that he is self-quarantining after being tested for Covid-19, as countries around the world again tightened lockdown measures.

Bolt was in quarantine on Monday as Jamaican media reported the sprint legend had tested positive for the coronavirus, only days after he celebrated his 34th birthday with a lavish party.

The retired 100m and 200m world-record holder didn’t confirm his test result, but he urged anyone who had been in contact with him to go into quarantine.

“I did a test on Saturday to leave (Jamaica) because I have work,” Bolt said in a video posted on Twitter. “I am trying to be responsible so I am going to stay in and be safe.

“Also, I am having no symptoms, I will quarantine myself and wait on the confirmation to see what is the protocol and to see how I go about quarantining myself from the Ministry of Health.

“Until then, I will call my friends and tell them once they came in contact with me to be safe, quarantine and take it easy,” said Bolt.

According to the Jamaica Observer, health and wellness minister Christopher Tufton confirmed late on Monday that the eight-time Olympic champion had tested positive.

Jamaica’s Prime Minister Andrew Holness also said police are investigating the circumstances surrounding Bolt’s birthday party.

Click on the link at the top to see a live version of virus information. Johns Hopkins Center for Systems Science and Engineering produced this website, which displays statistics about deaths and confirmed cases of the coronavirus, or Covid-19. Image: Johns Hopkins

Eight-time Olympic champion Bolt, who holds the world 100m and 200m records, last competed internationally at the 2017 World Championships in London.

Meanwhile, across the globe, experts were uncertain about the significance of the announcement from Hong Kong that doctors had confirmed a patient who survived the virus, and therefore was assumed to have immunity – only to catch it again. 

The patient, a 33-year-old man living in Hong Kong, had tested positive in March, but after two negative tests was found to be positive again in August.

Microbiologist Kelvin Kai-Wang To and lead author of the forthcoming study that details the findings, said: “Covid-19 patients should not assume after they recover that they won’t get infected again.”

But microbiologist Brendan Wren of the London School of Hygiene & Tropical Medicine said the case was “a very rare example of re-infection and it should not negate the global drive to develop Covid-19 vaccines.” 

And Jeffrey Barret, a senior scientific consultant for the Covid-19 Genome Project at the Welcome Sanger Institute said: “This may be very rare, and it may be that second infections – when they do occur – are not serious.”

Extended lockdowns

The pandemic has devastated the global economy, and policies to reduce the high risk of transmission in large groups of people have impacted everything from sport and religious services to music concerts and elections.

Breakneck efforts to develop a vaccine or effective treatments are under way around the world, but until one is available, social distancing measures remain among the few weapons against the virus.

New Zealand on Monday extended the lockdown of its biggest city to Sunday as it battled a small but persistent outbreak.

Auckland went into lockdown on August 12, a day after the virus re-emerged in the city and ended New Zealand’s run of 102 days without local transmission.

European nations have also tightened border restrictions, wary of new virus clusters.

On Monday, Germany added two regions of France, including the Paris region, to its list of at-risk zones, advising against anything but essential travel there.

Strict border controls came into effect in Finland Monday, with arrivals from just a handful of countries able to enter without virus restrictions.

Over the weekend, Norway tightened its border controls, and South Korea imposed social distancing measures nationwide to fight its latest outbreak.

Indonesia has banned foreign tourists from Bali, a popular holiday destination, for the rest of 2020 – scrapping plans to open up the island from September.

More pressure on Trump

The United States remains the hardest-hit country with more than 5.6 million infections and more than 177,000 fatalities.

In the past 24 hours another 883 people died and there were nearly 72,000 new cases of infection in America, Johns Hopkins University reported as of 0030 GMT Tuesday.   

President Donald Trump – who is seeking a boost from the Republican National Convention this week as he faces a tough re-election – is under intense pressure to curb the contagion.

On Sunday he announced at a news conference that the US has authorized the use of plasma therapy to help combat the virus, claiming it shows “an incredible rate of success” and “will save countless lives.”

But that went much further than his own health officials’ cautious welcome of the treatment.

Plasma from people who survive the disease is believed to contain antibodies that can help fight Covid-19 faster and has already been used on patients in the United States and other countries.

But the extent of its effectiveness is still being debated by experts and some have warned it could carry side effects.

Challenged by a reporter to explain the contradiction between his confidence in the treatment and the caution among experts, Trump passed the question to one of his experts and then ended the press conference.