COVID-19 may have longer incubation period of eight days, scientists say
Beijing: The incubation period of COVID-19, which is the time after which those infected with the novel coronavirus start showing the first symptoms, could be as much as eight days -- longer than previous estimates of four to five days says a new study which involved the largest amount of patient samples to date in such an analysis.
The research, published in the journal Science Advances, identified pre-symptomatic individuals at their time of departure from the Chinese city of Wuhan, where the COVID-19 pandemic originated, and then followed these infected people until their symptoms developed.
According to the scientists, including Chong You from Peking University in China, the existing estimates of four to five days for the incubation period were based on small samples sizes, limited data, and self-reports that could be biased by the memory or judgement of the patient or interviewer.
In the current study, they developed a low-cost approach to estimate incubation periods, and applied it to 1,084 confirmed cases of COVID-19 that had known histories of travel or residency in Wuhan.
The method has better accuracy by relying on a public database of dates of infection, and uses statistical methods to reduce recall bias -- the inaccurate recollection of past events, the scientists said.
Using the new approach, the researchers calculated that the average incubation period was 7.75 days, with 10 percent of the patients showing an incubation period of 14.28 days.
They said the findings may concern health authorities relying on the standard 14-day quarantine, but cautioned that their approach relies on several assumptions and may not apply to later cases in different parts of the world where the virus may have mutated.
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NIA registers case to probe recovery of 79 crude bombs in poll-bound West Bengal
New Delhi (PTI): The National Investigation Agency (NIA) on Sunday registered a case to probe recovery of 79 crude bombs in poll-bound West Bengal, officials said.
The move came following a directive by the Union Home Ministry in this regard, they said.
In pursuance to the home ministry's order, the anti-terror agency on Sunday registered a case, which was originally filed at Uttar Kashi police station, Bhangar division, Kolkata on Saturday, and took up the investigation, an NIA spokesperson said in a late night statement.
"The case pertains to recovery of 79 crude bombs and other incriminating materials by Kolkata police, which were being stored at a spot, thereby endangering human life and property," the spokesperson said.
Earlier in the day, the Election Commission had directed the West Bengal Police to launch a special drive to arrest those involved in illegal manufacturing of crude bombs in the poll-bound state, an official said.
It asserted that all cases related to the making of any such explosive would be probed by the National Investigation Agency, the official said.
The directive came after the police recovered a large number of crude bombs from the house of a person, allegedly a TMC worker, at Bhangar in South 24 Parganas district, days ahead of the second and final phase of the assembly polls in the state.
The explosives were recovered during a search at the residence of Rafikul Islam following specific inputs, the official said.
The poll panel also issued a warning to senior police officers across the state over any lapse in maintaining law and order before the April 29 polling.
The first phase of the assembly elections in West Bengal was held on April 23, while the second phase will take place on April 29. Votes will be counted on May 4.
A record 93.19 per cent turnout has been recorded in the first round of polling. Bhangar will vote in the second phase.
