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In ambulances, an unseen, unwelcome passenger: COVID-19 LOS ANGELES (AP) — It's crowded in the back of the ambulance. Two emergency medical technicians, the patient, the gurney — and an unseen and unwelcome passenger lurking in the air. For... AP NEWS

LOS ANGELES (AP) — It’s crowded in the back of the ambulance.

Two emergency medical technicians, the patient, the gurney — and an unseen and unwelcome passenger lurking in the air.

In a major setback, Merck to stop developing its Covid-19 vaccines - STAT Merck announced it is stopping development of both of the current formulations of the Covid-19 vaccines the company was working on. Matthew Herper STAT

Merck said Monday it will stop developing both of the current formulations of the Covid-19 vaccines the company was working on, citing inadequate immune responses to the shots.

Moderna says it's working on Covid booster shot for variant in South Africa, says current vaccine provides some protection Berkeley Lovelace Jr. CNBC

Moderna said Monday it’s accelerating work on a Covid-19 booster shot to guard against the recently discovered variant in South Africa.

Why Vaccines Alone Will Not End the Pandemic New estimates suggest the vaccine rollout is no match for the severity of the U.S. outbreak, and stricter social distancing measures are needed to reduce infections. nytimes

The coronavirus pandemic in the United States has raged almost uncontrollably for so long that even if millions of people are vaccinated, millions more will still be infected and become ill unless people continue to wear masks and maintain social distancing measures until midsummer or later, according to a new model by scientists at Columbia University.

The steady drumbeat of reports about new variants of the coronavirus — first in Britain, then in South Africa, Brazil and the United States — has brought a new worry: Will vaccines protect against these altered versions of the virus?