Melanie Plenda September 16, 2021 COVID-19 Breakthrough infections comprise small percentage of NH COVID-19 cases Melanie Plenda September 16, 2021 COVID-19 Only 3 percent of more than 50,000 COVID-19 cases reported in New Hampshire over the last eight months involve people who have been vaccinated, but that doesn’t stop a large percentage of Granite State residents from doubting that the vaccine works.