This article does not actually name the variant as 'P1' but it relates to Brazil and it names a 'new coronavirus variant' so it is without doubt that P1 is the varaint being remarked upon by Dr Rezende of the AMIB.
Also, the article does not comment on 'lethality' but only on patients present in ICU. However other data elsewhere indicates a typical mortality rate of 35.7% of ICU treated Covid-19 cases.
The number of COVID-19 patients under 40 in intensive care in Brazil surpassed older groups last month, a researcher said Sunday, amid a deadly surge driven partly by a new coronavirus variant.
The number of people aged 39 or younger in intensive care units with COVID-19 in March rose sharply to more than 11,000, or 52.2 percent of the total, said the Brazilian ICU Project.
That was up from 14.6 percent of total ICU patients early in the pandemic and around 45 percent from September through February.
"Previously, this was a population that would typically only develop a less-severe form of the disease and would not need intensive care. So the increase for this age group is very significant," said Dr. Ederlon Rezende, co-coordinator of the project, an initiative of the Brazilian Association of Intensive Medicine (AMIB).
Medical Express April 11th 2021
Note : This article is stated as 'CCO Public Domain'
Growing evidence shows that young people are not only more likely to get infected with P.1 but also to die from it, some experts have warned. The Brazilian Association of Intensive Care Medicine said that the number of 18-45 year olds requiring intensive care for covid-19 in February to March this year was three times greater than in September to November 2020,5 and coronavirus related deaths in that age group have almost doubled.
Maragareth Portela, a senior researcher at Fiocruz, said that Brazil’s saturated hospitals could partly explain the higher mortality rates, as patients were less likely to survive if beds and equipment were short and staff were overwhelmed.
Yet the increase is higher in regions where P.1 is more prevalent, suggesting that it is not only more transmissible but also more lethal. “It is very likely that the P.1 variant is more severe among young adults,” said Portela.
British Medial Journal 01 April 2021