Reasons for the increasing number of RSV cases across Australia at present
Respiratory Syncytial Virus (RSV)
Respiratory Syncytial Virus (RSV) a well-known respiratory disease, is currently seeing an increase in cases across Australia. RSV poses a significant threat, causing an estimated 3.2 million hospitalizations and 118,200 deaths worldwide in children under five years of age.
While some may experience symptoms similar to the common cold, others, especially infants and young children, the elderly, and immunocompromised individuals, face a higher risk of hospitalization.
Of particular concern is the situation in South Australia, where the number of cases is increasing rapidly. To give some perspective, during the first half of 2023, South Australia reported 3,926 cases of RSV compared to 539 during the same period in 2022, surpassing a four-fold increase. Hospitalization of children has emerged as a major problem associated with RSV. Young children are prone to serious lung complications such as pneumonia and bronchiolitis, which often require hospitalization.
Unfortunately, the situation is expected to worsen
. More cases are expected as winter progresses, and with hospitalizations at three percent, concerns are growing at the Women's and Children's Hospital. The increase in RSV cases can be attributed to population complacency. Since the lifting of COVID-19 restrictions, people in Australia have discarded their masks, neglected social distancing and in many cases become lax about proper hand hygiene. Some infected individuals also continued to work, visit stores, or send sick children to daycare, inadvertently spreading the virus.
As of July 3 of this year, a total of 69,997 laboratory-confirmed cases of RSV have been reported to the National Notifiable Disease Surveillance System (NNDSS). The breakdown of cases by state is as follows:
Australian Capital Territory (ACT): 1,130
New South Wales (NSW): 29,829
Northern Territory (NT): 164
Queensland (QLD): 17,158
South Australia (SA): 3,926
Tasmania (TAS): 670
Victoria (VIC): 14,933
Western Australia (WA): 2,187
RSV is a virus that primarily affects the respiratory tract and lungs, making it highly contagious and capable of causing various respiratory diseases such as bronchiolitis and pneumonia, as previously mentioned. While most patients can recover within one to two weeks, some individuals may experience recurrent wheezing and more severe symptoms.
Worldwide, RSV leads to an estimated 3.2 million hospitalizations and 118,200 deaths in children under the age of five annually, according to a study published in Nature Communications. However, RSV is clinically significant across all age groups due to the possibility of reinfection during life.
Most of Australia is currently experiencing peak RSV season. In temperate regions, seasonal outbreaks of RSV commonly occur in the fall and winter, with a peak in June and July, often preceding the flu season. In the tropical northern parts of Australia, RSV activity coincides with the rainy season from December to March, which corresponds to rainfall and humidity patterns.
RSV symptoms range from mild to severe. In mild cases, individuals may experience a stuffy nose or runny nose, dry cough, mild fever, sore throat, sneezing, and headache. Severe cases present with fever, severe coughing, wheezing (a high-pitched sound when exhaling), rapid or difficult breathing (often prefers an upright position), and bluish discoloration of the skin due to lack of oxygen. Infants may exhibit short, shallow, and rapid breathing, chest muscles and skin pulling in with each breath, coughing, poor feeding, lethargy, and irritability.
The Therapeutic Goods Administration (TGA) self-test RAT (Rapid Antigen Test) was approved for RSV testing in May. This test can detect RSV, influenza A and B, as well as COVID-19; however, its availability remains limited. A visit to a general practitioner or emergency room can also confirm the condition of the disease.
Prevention of RSV follows the same principles as for influenza and COVID-19. It emphasizes hand hygiene, leaving sick children at home and observing preventive measures. Unfortunately, many people have stopped practicing these precautions, which has contributed to the significant increase in RSV cases seen recently, as UniSA epidemiologist Adrian Esterman pointed out.