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Highlight for Query ‹Canine influenza risk

Respiratory Syncytial Virus Infection Morbidity in the Elderly: Time for Repurposing of Ribavirin?

To the Editor—We have read with great interest the report by Ackerson et al on the morbidity and mortality rates associated with respiratory syncytial virus (RSV) compared with influenza virus infections in older adults. They conclude that RSV may result in higher morbidity and mortality rates among older hospitalized adults than influenza virus.

These results are an important step in recognizing the impact of RSV across the whole patient population. Historically, the most attention has been paid to RSV infections in infants and in the moderately to severely immunocompromised and less to infection in the population described by Ackerson et al, namely, adults >60 years old. Unlike previous reports comparing hospitalization in RSV and influenza virus infections, the authors found a higher incidence of hospitalizations lasting ≥7 days in the RSV cohort than in the influenza virus cohort, which they suggest may reflect the increased use in recent years of antivirals directed at influenza virus, but not RSV. They reported that 47.1% of RSV-infected and 78.6% of influenza virus–infected individuals received antiviral therapy during the hospitalization period; 99% received oseltamivir, even though oseltamivir has no activity against RSV.

Inhaled ribavirin and palivizumab are currently the only registered treatment options for RSV in addition to supportive care; however, inhaled ribavirin is rarely used in nonimmunocompromised adults because of the limited evidence for its efficacy, its price, and the occupational risk to healthcare workers exposed of ribavirin aerosols [2, 3]. Vaccines and new antivirals are being tested, but they are not yet available for daily practice. The aging population, however, may benefit from using oral ribavirin, which has been described in the setting of hematopoietic stem cell and lung transplantation. Although evidence from randomized controlled trials is lacking, ribavirin treatment may have a beneficial effect in reducing morbidity and mortality rates or improving recovery of pulmonary function after RSV infection in transplant recipients [5–7]. As shown elsewhere, oral ribavirin may not be inferior to inhaled therapy in this population and may provide a good and affordable treatment option [8, 9]. Whether these data can also be applied to the population of older adults remains to be confirmed.

The absence of evidence for the efficacy of oral ribavirin in elderly persons, combined with the widespread incidence and detrimental effects of RSV infection in this population, shown by Ackerson et al and others [1, 10], underlines the need for a well-designed randomized controlled trial to determine the benefit of a short course of oral ribavirin for RSV in elderly patients, analogous to the current use of oseltamivir for influenza virus. This is especially important in the light of upcoming (and probably expensive) new antivirals, for which ribavirin could be considered as an active comparator. Furthermore, considering the high incidence and availability of quick diagnostic methods for RSV, we deem such a study not only needed but also certainly feasible.