A mask mandate was re-implemented in California’s San Mateo County, where nearly 90 percent of residents are fully vaccinated, according to officials this week. Starting Monday, all residents—including those who are vaccinated—will have to wear face masks in government offices, health clinics, and other public facilities. Masks are not mandated—but recommended—inside other public areas such as restaurants, gyms, theaters, and grocery stores, according to a press release from the county. About 89 percent of residents aged 12 and older in San Mateo, located south of San Francisco, are vaccinated against COVID-19, county data shows. COVID-19 is the illness caused by the CCP (Chinese Communist Party) virus. But despite the high vaccination rate, the county officials said masking is needed due to the “highly transmissible Delta variant” that has become more prevalent around the United States. As a result, it explained, “health officers around the Bay Area have recommended that everyone …