MECKLENBURG COUNTY, Va. (WRIC) -- The Southside Health District in the town of Boydton in Mecklenburg County is monitoring an increase in reported cases of pertussis, also known as whooping cough. According to officials, Southside Health District staff are working closely with local healthcare providers to identify and treat potential cases of pertussis. The Virginia Department of Health reports that pertussis is a highly contagious respiratory disease caused by bacteria that spreads through droplets released into the air by sneezing or coughing. The illness often begins with symptoms that resemble a cold, such as a runny nose, sneezing, mild fever and cough, according to officials. The department said individuals with pertussis are most contagious during the first two weeks when these cold-like symptoms are present and remain contagious for up to three weeks after the onset of the cough. If untreated, people infected may develop severe respiratory symptoms, including coughing fits that may lead to difficulty breathing, gagging, vomiting and a cough that ends with a high-pitched "whooping" sound when trying to catch their breath, according to officials. Anyone showing symptoms of pertussis is advised to seek medical evaluation and avoid public or group settings. According to the department, vaccination is the best way to prevent the spread of pertussis. People are advised to consult with a healthcare provider to determine if an additional vaccine is necessary to protect themselves against the respiratory disease. To help prevent the spread of pertussis, the department encourages people to practice the following: Cover your mouth and nose with a tissue when you cough or sneeze. If a tissue is not available, cough or sneeze into your upper sleeve or elbow, not your hands.  Wash your hands frequently with soap and water for at least 20 seconds. If soap and water are not accessible, use an alcohol-based hand sanitizer.  Do not share food, drinks, vaping products, or any items that have come into contact with someone else's saliva.  If you are ill, stay home. Anyone with questions or concerns about pertussis is asked to consult a primary healthcare provider. People can also contact the Mecklenburg County Health Department at 434-738-6815.