Because the COVID-19 Delta variant is much more transmissible (translating to a higher R rate of 50-100% higher than a year ago) and mRNA vaccines are 90% effective, we need 90% of the population to be vaccinated to achieve herd immunity. Unfortunately that seems unlikely due to the politicization of the vaccine.
Read Delta Variant - Everything you need to know.
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Half of COVID-19 Survivors Had Lingering Symptoms After 1 Year
A study in China of COVID-19 survivors (median age 59) who were hospitalized found that half had a persisting symptom one year later—Long COVID. That includes shortness of breath, fatigue, and mental health issues such as anxiety depression. It also found a higher prevalence of problems with mobility and pain and discomfort than the control group.