JERUSALEM—Israeli Finance Minister Avigdor Lieberman said on Saturday that he had tested positive for COVID-19 and would self-isolate but continue working from home. “I feel good and will isolate in the next few days,” Lieberman said on Twitter. Foreign Minister Yair Lapid tested positive on Monday. On Jan. 10, Lieberman posted a photo of himself receiving a fourth COVID-19 vaccination dose. Israel began administering a second round of boosters to immune-compromised people in late December, expanding the campaign to its over-60-year-olds and medical staff in January. The Health Ministry says that a first booster increases protection seven days after the shot but has not yet released data on the effectiveness of a fourth dose.