The formulation of accurate clinical case definitions is an integral part of an effective process of public health surveillance. Although such definitions should, ideally, be based on a standardized and fixed collection of defining criteria, they often require revision to reflect new knowledge of the condition involved and improvements in diagnostic testing. Optimal case definitions also need to have a balance of sensitivity and specificity that reflects their intended use. After the 2009–2010 H1N1 influenza pandemic, the World Health Organization (WHO) initiated a technical consultation on global influenza surveillance. This prompted improvements in the sensitivity and specificity of the case definition for influenza – i.e. a respiratory disease that lacks uniquely defining symptomology. The revision process not only modified the definition of influenza-like illness, to include a simplified list of the criteria shown to be most predictive of influenza infection, but also clarified the language used for the definition, to enhance interpretability. To capture severe cases of influenza that required hospitalization, a new case definition was also developed for severe acute respiratory infection in all age groups. The new definitions have been found to capture more cases without compromising specificity. Despite the challenge still posed in the clinical separation of influenza from other respiratory infections, the global use of the new WHO case definitions should help determine global trends in the characteristics and transmission of influenza viruses and the associated disease burden.

During the COVID-19 pandemic, many addiction treatment and harm reduction organizations have had to reduce their hours and services for people with substance use disorders, placing these individuals at increased risk of death. In order to address restricted treatment access during COVID-19, guidance from the Substance Abuse Mental Health Services Administration, the US Drug Enforcement Administration, and the US Department of Health and Human Services has allowed for use of audio-only telehealth encounters for buprenorphine induction without requiring an in-person evaluation or video interface. This has enabled innovations in order to try to meet the needs of the most vulnerable among us during the current pandemic. In this new regulatory environment, we established the Rhode Island Buprenorphine Hotline, a phone hotline which functions as a "tele-bridge" clinic where people with moderate to severe opioid use disorder can be linked with a DATA 2000 waivered provider who can provide an initial assessment and, if appropriate, prescribe buprenorphine for unobserved induction and linkage to outpatient treatment. In this correspondence we briefly share our experience developing this common sense approach to addressing the complex problem of access to treatment only now permissible due to regulatory changes during COVID-19.