Support for Japanese Prime Minister Yoshihide Suga slid nine points to 34 percent, the lowest since he took office, a survey showed on Monday, as worries about Covid-19 clouded his hopes the Tokyo Olympics would boost his ratings ahead of an election this year.

Nearly two-thirds of respondents to the July 23-25 Nikkei business daily survey said the country's rollout of coronavirus vaccinations was not going well...