A meta-analysis article showed evidence that a history of hamstring injury and being of older age were associated with increased risk of hamstring strains. One study found that men and master athletes (athletes older than forty) were at an increased risk of hamstring strains compared with women and younger athletes. Women were approximately 3 times more likely to develop hamstring strain than males with the majority of these being non-sporting scenarios. Similarly the average age of non-sporting hamstring strains are from the ages of 40–60. Many of these non-sporting injuries are sustained during road traffic accidents, slipping, and falling. These results also show that hamstring strains account for 50% of muscle injuries received by sprinters and are the most common injury in hurdling. One explanation is that older active individuals may be at greater risk due to lower levels of eccentric knee flexor strength compared with their younger counterparts. However, it is unclear whether flexibility serves as a risk factor; this topic should be researched in the future to further understand the relationship between flexibility and risk of injury. Muscle weakness has also been an implication as a predisposing factor for both primary and recurring hamstring strain injuries. Over a 10-year study more than 51.3% of hamstring strains occurred during the preseason of athletics. In another study, that analyzed 25 NCAA sports over four years, it was clearly shown that hamstring strain rates are higher in the preseason.
Azithromycin is an antibiotic medication used for the treatment of a number of bacterial infections. This includes middle ear infections, strep throat, pneumonia, travelers diarrhea, and certain other intestinal infections. Along with other medications, it may also be used for malaria. It can be taken by mouth or intravenously with doses once per day.Common side effects include nausea, vomiting, diarrhea and upset stomach. An allergic reaction, such as anaphylaxis, QT prolongation, or a type of diarrhea caused by Clostridium difficile is possible. No harm has been found with its use during pregnancy. Its safety during breastfeeding is not confirmed, but it is likely safe. Azithromycin is an azalide, a type of macrolide antibiotic. It works by decreasing the production of protein, thereby stopping bacterial growth.Azithromycin was discovered in 1980 by the Croatian pharmaceutical company Pliva and approved for medical use under the brand name Sumamed in 1988. It is on the World Health Organizations List of Essential Medicines. The World Health Organization classifies it as critically important for human medicine. It is available as a generic medication and is sold under many trade names worldwide. In 2019, it was the 48th most commonly prescribed medication in the United States, with more than 15 million prescriptions. Medical uses
Azithromycin is used to treat diverse infections, including:

Prevention and treatment of acute bacterial exacerbations of chronic obstructive pulmonary disease due to H. influenzae, M. catarrhalis, or S. pneumoniae. The benefits of long-term prophylaxis must be weighed on a patient-by-patient basis against the risk of cardiovascular and other adverse effects.