Occasionally, the hikers came across a piece of clothing, a water bottle, a backpack, or a .50 caliber bullet casing leftover from bombing and live-fire exercises at the nearby Barry M. Goldwater Air Force Range. But signs of human life are largely absent in this harsh and unforgiving landscape. The southern Arizona sun, 15 miles from the Mexico border, was brutally hot, even in the early hours of a March morning. The intimidating Growler Mountains loomed over the flat and exposed desert expanse from the east. Shade could be found under the sparse trees that lined a sprawling wash that snaked through the Growler Valley. But to reach the trees often meant passing through thickets of dry, thorny brush that surrounded them.
Updated 12:02 a.m. ET, February 3, 2021
What you need to know
Dr. Anthony Fauci says people who ve had Covid-19 could be reinfected if variants become dominant and urged Americans to get vaccinated to stop new strains emerging.
The US suffered its deadliest month of the pandemic in January, with more than 95,000 Covid-19 deaths. New case numbers, however, are falling in most states.
After criticism last year for an early rollout, Russia’s Sputnik V coronavirus vaccine is 91.6% effective against symptomatic Covid-19, according to interim analysis published Tuesday.
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1:01 a.m. ET, February 2, 2021
Fauci urges vaccinations to stop new virus strains: Viruses cannot mutate if they don t replicate
People previously infected with Covid-19 may only need one vaccine dose, study suggests
From CNN’s Amanda Sealy and Michael Nedelman
A health worker administers a dose of the Covid-19 vaccine in Petah Tikva, Israel on February 1. Jack Guez/AFP/Getty Images
After getting just one shot of a Covid-19 vaccine, people who were previously infected showed antibody levels equal to or above those of people who had gotten both doses but never been infected, according to a study published Monday.
Those with previous infections also appeared to have more generalized side effects after the first dose, such as fatigue, fever and muscle pain similar to what other participants might be expected to have after a second dose of an mRNA vaccine, the researchers wrote.
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DR Anthony Fauci has warned that Covid jabs might be useless against ominous mutant strains spilling out from South Africa and Brazil
America is in a race against mutant strains but Joe Biden s goal of delivering 100million doses of Covid vaccine over the first 100 days of his presidency is absolutely a doable thing, the expert added.
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Dr Anthony Fauci told Chuck Todd that experts are taking the mutant coronavirus strains really very seriously Credit: NBC News
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Health workers about to administer Pfizer Covid jabs at a new vaccination site in Harlem, New YorkCredit: AFP or licensors
The famous medical expert aired his concerns to Chuck Todd on Sunday while appearing on NBC s Meet The Press.