Over the past two decades, traditional antimicrobial strategies have lost efficacy due to a rapid rise in antibiotic resistance and limited success in developing new antibiotics. Rather than relying on therapeutics solely targeting the bacterial pathogen, therapies are emerging that simultaneously focus on host responses. Here, we describe the most promising 'host-informed therapies' (HITs) in two categories: those that aid patients with fully functional immune systems, and those that aid patients with perturbed immune processes. Using Streptococcus pneumoniae, the leading cause of bacterial pneumonia, as a case study, we show HITs as an attractive option for supplementing infection management. However, to broaden their applicability and design new strategies, targeted research and clinical trials will be essential.
The host response is integral to disease outcomeThe introduction of vaccines and antimicrobials are among the most important strategies that have enabled us to drastically curb the spread and impact of infectious diseases. However, several challenges have impeded their continued efficacy, including the rapid rise of antibiotic resistance, the largely unsuccessful efforts to identify novel classes of antibiotics, and the limited antigenic breadth of vaccines. Rather than relying on therapeutic strategies that solely focus on bacterial killing, growth inhibition, and infection eradication, treatment strategies are emerging that modulate the host, particularly the immune system. These therapies are focused on enhancing the host response and/or defenses against the infection, with the potential to significantly improve disease outcome and host health.