Children with COVID-19 may have lower infectivity than adults, UK scientists say

LONDON (Reuters) - Children have milder COVID-19 symptoms than adults and the balance of evidence suggests they may also have lower susceptibility and infectivity than adults, scientists advising the British government have said.

As Europe and the United States start to return to work after lockdowns imposed to slow the spread of the novel coronavirus, world leaders are trying to work out when it is safe for children and students to get back to their studies.

Cautioning that there is a significant lack of high-quality evidence on children, the scientists concluded in a paper submitted to the British government that: “There was some evidence that children had milder symptoms than adults but that evidence on susceptibility and transmission was as yet unclear.”

In another paper submitted to the government, scientists said: “Evidence remains inconclusive on both the susceptibility and infectivity of children, but the balance of evidence suggests that both may be lower than in adults.” In a third, April 29, document, Professor Russell Viner of University College London and Dr Rosalind Eggo of the London School of Hygiene & Tropical Medicine said UK clinical data confirmed that children have notably less symptomatic disease and of lower severity than adults.

“Evidence remains inconclusive on both susceptibility and transmissibility of children, but balance of evidence suggesting both may be lower,” Viner and Eggo said.

“Serological studies are starting to be available on child infection history with some suggesting low rates of infection,” they said. “These must be interpreted with caution.”

“There is limited evidence about transmission from children, with some leaning towards lower transmission from children.”

WASHINGTON (Reuters) - Astronomers have gazed into what appears to be a planetary maternity ward, observing for the first time within a huge disk of dense gas and dust surrounding a newly formed star a planet in the process of being born.

This large young planet is forming around a star called AB Aurigae that is about 2.4 times the mass of the sun and located in our Milky Way galaxy 520 light years from Earth, researchers said on Wednesday. A light year is the distance light travels in a year, 5.9 trillion miles (9.5 trillion km).

The scientists used the European Southern Observatory’s Very Large Telescope in Chile to spot a spiral structure within the swirling disk around AB Aurigae generated by the presence of a planet. They detected a “twist” pattern of gas and dust in the spiral structure marking where the planet was coalescing.

“It takes several million years for a planet to be in its final stage, so birth is not well defined in time. However, we can say that we were likely able to catch a planet in the process of formation,” said Observatoire de Paris astronomer Anthony Boccaletti, who led the research published in the journal Astronomy & Astrophysics.

More than 4,000 planets have been discovered orbiting stars beyond our solar system. Scientists are eager to learn more about how they are born as cold gas and dust consolidate in these disks surrounding new stars.

The planet is located about 30 times further from its star than Earth’s distance from the sun about the distance of the planet Neptune in our solar system, Boccaletti said. It appears to be a large gas planet, not a rocky planet like Earth or Mars, and may be more massive than our solar system’s largest planet Jupiter, Boccaletti added.