Nation Cases fall, variant cases multiply in US; IRS won’t push back tax deadline: Latest COVID-19 updates February 15, 2021February 15, 2021 Elinor Aspegren, USA TODAY Comments Off on Cases fall, variant cases multiply in US; IRS won’t push back tax deadline: Latest COVID-19 updates As US cases decrease, the number of variants is multiplying. The IRS says it won't push back the April 15 deadline this year. Latest COVID-19 news.