The global tally for the coronavirus-borne illness climbed above 187 million on Tuesday, while the death toll climbed further above 4.03 million, according to data aggregated by Johns Hopkins University . The U.S. leads the world with a total of 33.88 million cases and in deaths with 607,400.The Food and Drug Administration told Pfizer /zigman2/quotes/202877789/composite PFE +1.04% executives that it sees no need for vaccine boosters right now. Separately, the Centers for Disease Control and Prevention said it has received reports of 100 people who got the Johnson & Johnson /zigman2/quotes/201724570/composite JNJ +0.55% shot developing Guillain-Barré syndrome, an immune system disorder that can cause muscle weakness and occasionally paralysis. That number represents a tiny fraction of the nearly 13 million Americans who have received the one-dose vaccine. Most cases of the side effect were reported in men - many 50 years old and up - and usually about two weeks after vaccination. India is closing in on the U.S. in cases at 30.87 million but is third in deaths at 408,764, while Brazil is second in deaths at 534,344 but is third in cases at 19.1 million. Mexico has fourth-highest death toll at 235,058 but is 15th in cases with 2.6 million. In Europe, Russia leads in deaths with 142,102 fatalities, while the U.K. has 128,697, making Russia the country with the fifth-highest death toll in the world and highest in Europe.