CNN — With the recent increase of Covid-19 infections and hospitalizations due to the spread of the more dangerous Delta variant, health experts and officials expect the surge to worsen as long as large segments of the country remain unvaccinated. “I think we will see this big, steep acceleration,” Dr. Peter Hotez, co-director for the Center for Vaccine Development at Texas Children’s Hospital, said to CNN’s Anderson Cooper on Friday. “As bad as things are right now in the South, they are about to get worse for lots of unvaccinated individuals.” Officials in Southern states, where vaccination rates have generally lagged other parts of the country, are working to get the message out. In Florida, Covid-19 cases have jumped 50% over the last week, according to state health data. Allen J. Schaben/Los Angeles Times/Getty Images Los Angeles, CA - July 26: First grade student Daniel Cano, 5, and his mom, Sonia Cano, walk past COVID-19 safety precaution/ social distancing and hand washing signs at a L.A. Unified "meet and greet" with its medical advisors as they answer questions and present the safety preparations at Euclid Avenue Elementary School Monday, July 26, 2021 in Los Angeles, CA. Parents have until Friday to choose whether to return their children to in-person classes or remain online in the fall. The first day of school is in mid-August. (Allen J. Schaben / Los Angeles Times via Getty Images) If we want kids back in school and the economy to prosper, more of the US needs to get vaccinated, expert says In Georgia, the case rate has more than tripled over the last 14-day period, the state Department of Public Health announced Friday as it urged residents to get vaccinated since the Delta variant is more transmissible than earlier Covid-19 strains. “Unfortunately, we can expect Covid numbers to keep growing. People who are unvaccinated or skip their second dose of vaccine are targets for infection,” said Georgia health commissioner Dr. Kathleen E. Toomey. More Americans may be responding to the crisis, as recent data from the US Centers for Disease Control and Prevention shows the pace of vaccinations is going up. A seven-day average of more than 418,000 people are initiating vaccination daily, which is the highest daily pace since July 5. Entering the weekend, 49.5% of Americans of all ages are fully vaccinated, according to CDC data. Nearly 33% of those eligible for vaccination – those ages 12 and up – have yet to receive at least one dose. Paul Hennessy/SOPA Images/LightRocket/Getty Images Nurses at a treatment tent outside the emergency department at Holmes Regional Medical Center in Melbourne, Florida, which serves as an overflow area for those with Covid-19 infections. Mask mandates return for vaccinated and unvaccinated Due to the increased transmissibility of the Delta variant, officials are preaching for all Americans – regardless of vaccination status – to be mindful of their surroundings. Aerosols containing Covid-19 can travel as easily as the smoke from a cigarette, Michael Osterholm, director of the Center for Infectious Disease Research and Policy at the University of Minnesota, said Friday. “If you want to understand what an aerosol is, just think of somebody smoking,” Osterholm told CNN. “If you can smell a cigarette in the location you’re at, then you’re breathing someone else’s air that may have the virus in it.” Osterholm noted that while indoor transmission of the virus is the main challenge, there are examples of Covid-19 being transmitted outdoors, when people were close together for extended periods of time. Because of this, mask mandates are making a return in more cities. On Friday, the cities of Birmingham, New Orleans, and Louisville each announced plans to reinstitute mask mandates to lower indoor transmission. “If we take the steps that are necessary to squash the amount of disease that is there now, we can do so in a matter of weeks, if we all get vaccinated, if we wear masks,” CDC director Dr. Rochelle Walensky told Fox News on Friday. The CDC this week changed its guidance on mask usage and advises vaccinated people to resume mask wearing indoors in areas of sustained or high transmission of the virus. A recent study shows the Delta variant can produce similar amounts of virus in both vaccinated and unvaccinated people, yet real-world data is demonstrating that unvaccinated people are at much higher risk for severe illness. More than 80% of the US population — about 274 million people — live in a county considered to have “high” or “substantial” Covid-19 transmission, according to a CNN analysis of data published Friday by the CDC. ICUs are filling up again As the Delta variant spreads, hospitalizations are accumulating to levels of concern. Mississippi, which has one of the lowest rates of vaccination among US states, is dealing with a skyrocketing level of Covid-19 patients needing hospitalization. Data from the Mississippi Department of Health on Friday showed that out of 827 ICU beds statewide, only 107, or approximately 13%, are currently available. All 88 beds in the University of Mississippi Medical Center’s intensive care unit, the state’s largest, are full. State Health Officer Thomas Dobbs said Thursday that hospitalizations are beginning to be seen in younger age groups. He pointed to data that shows 88% of hospitalizations are among unvaccinated people, and it is having a “significant spill-over effect to older, vaccinated Mississippians.” In Texas, Austin Public Health says the region is facing the lowest staffed ICU bed capacity since the beginning of the pandemic, with only 16 staffed beds available. “Our ICU capacity is reaching a critical point where the level of risk to the entire community has significantly increased, and not just to those who are needing treatment for Covid,” Austin-Travis County Health Authority Dr. Desmar Walkes said on Friday. “If we fail to come together as a community now, we jeopardize the lives of loved ones who might need critical care.” Throughout the state, several trauma service areas each had less than ten ICU beds available on Friday, according to Texas health data. Some of the areas affected include Amarillo, Wichita Falls, Abilene, Killeen, Waco, Beaumont, and Victoria. Florida healthcare facilities continue to prepare for the surge, as the AdventHealth Hospital System stopped all non-emergency surgeries and procedures due to high Covid-19 hospitalization. AdventHealth Central Florida Chief Clinical Officer Dr. Neil Finkler said on Friday that over 90% of the Covid-19 patients currently hospitalized are unvaccinated. “None of these patients thought they would get the virus, but the Delta variant has proven to be so highly contagious that even the young and the healthy, including pregnant patients, are now starting to fill up our hospitals,” Finkler said. CNN’s Deanna Hackney, Lauren Mascarenhas, Deidre McPhillips, Jennifer Henderson, Raja Razek, Brandon Miller and Hollie Silverman contributed to this report.