Drugmaker says lab tests show half-dose booster shot increased by 37 times the level of so-called neutralizing antibodies able to fight new strain of coronavirus

British health secretary won't rule out further regulations before end of week, with nation facing surge of infections; US senators Warren and Booker contract virus

Ministers vote to add 10 countries to 'red' travel list; daily caseload highest since October; health minister says parents must be responsible and vaccinate kids

While antibodies produced by vaccines don't work as well against the new variant, scientists say that we can still rely on T cells to help the vaccinated avoid severe cases

White House's top medical adviser says dire situation in US hampered by fact that so many people are still not getting vaccinated, says virus is very unpredictable

Virologist predicts shortage of GlaxoSmithKline's drug, the only one that remains effective, after Regeneron, Eli Lilly say their therapies appear less useful against new strain

PM advises work from home, pleads with public to vaccinate their children before strain becomes widespread, which he predicts will happen in several weeks

Ministry says 380 others suspected to have new strain; vast majority of infections are among returning travelers; Knesset building imposes restrictions after workers contract COVID

Country has Middle East's worst reported death rate from COVID; 60% of population vaccinated with 2 doses

Ministers expected to authorize the decision later Sunday, with countries to be designated ‘red’ starting Wednesday