More than 4,000 Maryland public school students have tested positive for COVID and 16,500 have had to quarantine since start of school year

Baltimore County had 1,163 students quarantined, Anne Arundel had 1,512, Carroll had 1,221, Harford had 1,113 and Howard had 1,341. The school systems have widely different total enrollments. Baltimore County has about 115,000 students compared to Carroll’s roughly 24,000 students.