JOHANNESBURG — Some South Africa hospital wards are jammed with patients infected with the omicron coronavirus variant as President Cyril Ramaphosa urged South Africans on Monday to get vaccinated. In the past week, cases have reached more than 16,000, up dramatically from 2,300 last Monday, according to South Africa's National Institute for Communicable Diseases. The NICD says the increase in cases in such a short period of time is “unprecedented” in the trajectory of the pandemic, now in its fourth phase in the country. “Unfortunately, we’re seeing a more than doubling of hospital admissions each day,” said Ian Sanne, an...