well, there's really good news when it comes to covid. the united states averaging around 31,000 new covid cases this past week. that's the lowest average in nearly a year. health officials, though, they're still worried about declining vaccination rates across the country. >> and over the past week, less than 2 million doses were administered per day. that's a 46% drop from its peak just a month ago. less than half of americans have received at least one vaccine dose. and only 38% of the population is fully vaccinated. we know that is a long way from herd immunity, considering the fact that we need 75% to 80% vaccination for that. >> let's get to cnn's polo sandoval. he has more on states beginning to increase vaccinations. polo, do we know what areas of the country specifically are lagging. >> reporter: well, christi and boris, referring to some of those states with lowest per capita. many are like louisiana,