General practitioner management of notifiable diseases is central to communicable disease control

To the Editor: Public health units routinely carry out investigations into cases of notifiable diseases, specified by state and territory Public Health Acts, because of the potential impact on the health of the public. Investigations involve contacting individuals and their contacts, and providing advice for follow up and treatment. This may include seeing a general practitioner for further testing, treatment, or prophylaxis of contacts.1 To assess the extent of input from GPs in managing notifiable diseases we documented GP encounters related to public health unit communicable disease control activity in inner-western and south-western Sydney.

Data on routine communicable disease activity in Sydney and Sydney South West Local Health Districts were collected over 2 months from 1 June to 31 July 2014. For all investigations into suspected and confirmed cases of notifiable disease, data were collected on the type of condition, visits to GPs and tests specifically requested as part of routine public health follow-up. The study was approved by Sydney Local Health District Ethics Review Committee. There were 220 investigations associated with suspected or confirmed cases of 34 notifiable conditions during the study period, requiring 212 GP visits and 286 tests. The Box lists conditions according to their required level of GP input (those involving GP encounters more than 50% of the time were considered to require high-level GP input). Influenza and gastroenteritis outbreaks, typhoid, rubella, hepatitis E and measles were the conditions requiring the highest level of GP input per investigation. Measles, arbovirus, pertussis and gastroenteritis outbreaks were conditions with the highest frequency of suspected or confirmed cases that also required high-level GP input. Based on population size, we estimated that, if extrapolated to state level, communicable disease control activities would have resulted in about 1047 GP visits across New South Wales in the same time period.

Our findings indicate that GP encounters are central to communicable disease control and shed light on which conditions require the most input from GPs. Influenza outbreaks, measles and gastroenteritis outbreaks are of particular concern. Influenza outbreaks require particularly high-intensity input from GPs, while measles and gastroenteritis outbreaks are frequently investigated conditions that require high-level GP input. Influenza and measles are serious conditions, often involving vulnerable populations (nursing home residents and children).2,3 Our results indicate that primary care plays an important role in protecting the public from conditions with potentially serious consequences. This finding should be considered in policy discussions about access to primary care.