Virus cases climbing in Ohio despite 60% vaccination rate SHARE COLUMBUS, Ohio — Ohio reported its largest single-day increase in COVID-19 cases in eight weeks on Tuesday as the more contagious delta variant spreads. What You Need To Know Infections and hospitalizations continue to rise in Ohio Officials warn that low vaccination rates are a risk factor The more contagious delta variant is spreading widely The state added 744 cases while seven-day average infections increased to 491, a 133% increase in less than two weeks. Following months of declining cases, the abrupt reversal of trends comes despite Ohio surpassing a 60% vaccination rate for its adult population.