TAIPEI, Taiwan—Taiwan has recorded its first case of the omicron variant in a passenger who recently traveled to the southern African country of Eswatini, health officials said Saturday. The passenger, a Taiwanese woman in her 30s who returned on Dec. 8, is now in quarantine in hospital, according to the Central Epidemic Command Center, which is in charge of the island’s pandemic response. Passengers who sat near her on the plane have tested negative so far. Taiwan reported 10 new coronavirus cases on Saturday, all of which were identified in travelers entering from abroad. The self-ruling island has a strict two-week quarantine on arrival and has sealed its borders off to all but residents and citizens, with few exceptions. There is little community transmission within its borders of the disease and there has been few restrictions on movement internally in recent months. Mask wearing is nearly universal. While the omicron …