Abigail Hamilton

1 Introduction Corneal ulceration is a common equine ophthalmic disease. A complicated corneal ulcer is one that does not heal in an expected time frame or shows signs of infection [1, 2]. The causes of complicated corneal ulcers include nonhealing ulcers, ulcers caused by persistent trauma, or infected ulcers [3]. Differentiation is frequently achieved through comprehensive ophthalmic examinations and diagnostic sampling such as corneal cytology, culture, and PCR.

In general, school absenteeism rates remain far higher and grade-level progress far lower than before the COVID-19 pandemic. That’s certainly the case in Colorado. Chronic absenteeism (defined as students missing 10 percent or more of a school year) is a major factor in learning loss, and in the Centennial State, it rose more than 13 percent between 2018–19 and 2021–22. District data reveal similar patterns: In 2022–23, 41 percent of Denver Public School students were chronically absent.