Rhinoviruses Treatment & Management
- Author: Michael Rajnik, MD; Chief Editor: Burke A Cunha, MD more...
Medical Care
Rhinoviral infections are predominately mild and self-limited; thus, treatment is generally focused on symptomatic relief and prevention of person-to-person spread and complications. The mainstays of therapy include rest, hydration, antihistamines, and nasal decongestants.
Antibacterial agents are not effective unless bacterial superinfection occurs. Development of effective antiviral medications has been hampered by the short course of these infections. Because peak symptom severity occurs at 24-36 hours after inoculation, antivirals have only a narrow window to positively affect a rhinoviral infection. In addition, the cause of the common cold is not always rhinoviral infection. Therefore, rapid and accurate diagnostic tests would be needed if a specific antiviral therapy were developed.
- Because of the large number of rhinovirus immunotypes and the inaccessibility of the conserved region of the viral capsid (the most likely effective site for targeting a vaccine), no rhinovirus vaccine is on the horizon.
- Because infection is spread by hand-to-hand contact, autoinoculation, and, possibly, aerosol particles, emphasize appropriate hand washing, avoidance of finger-to-eyes or finger-to-nose contact, and use of nasal tissue.
- Heated humidified air has been used for decades for the alleviation of symptoms due to rhinoviral infections but has never been shown to improve objective outcome measures.[5]
- Numerous agents are under investigation for the treatment of viral infections.
- Pleconaril inhibits approximately 92% of rhinovirus serotypes. Susceptibility to pleconaril depends on the viral capsid surface protein VP1. A double-blind, randomized, placebo-controlled trial of pleconaril 400 mg PO tid for 5 days, initiated within 24 hours of symptom onset, resulted in a decrease in the duration of symptoms by 1 day.[6]
- Steroids have been examined as a therapeutic modality and have shown little effect with rhinoviruses. One recent article noted that children who experienced wheezing during a rhinoviral infection and were treated with prednisolone experienced fewer wheezing episodes than untreated individuals in the subsequent 2 months. However, no change in time to discharge was noted.[7]
- A blinded, placebo-controlled trial using intranasal interferon-alpha-2b and ipratropium with oral naproxen started within 24 hours of rhinovirus inoculation decreased viral shedding, geometric mean virus titers, and symptoms in the treatment group. Similar findings were reported with the use of intranasal interferon-alpha-2b, chlorpheniramine, and ibuprofen. Recombinant interferon-alpha-2b applied topically to the nose at 5 million U or more per day prevented experimental infections. Unfortunately, the effect of this agent on symptomatic illness was limited.[8]
- A recombinant soluble intercellular adhesion molecule-1 (ICAM-1) administered intranasally 6 times per day and beginning either 7 hours before or 12 hours after rhinovirus challenge was analyzed in a randomized, double-blinded study. Neither strategy affected the incidence of infection, but combining results from both treatment groups found a 23% decrease in clinical colds, a 45% decrease in total symptom score, and a 56% decrease in total nasal secretion weight.[9]
- 3C protease inhibitors are currently being evaluated in human trials, but no data are currently available. A phase II study found that ruprintrivir, a 3C protease inhibitor, delivered as a nasal spray was well tolerated and decreased positive viral culture results and improved symptom scores but did not decrease the frequency of colds.[10] These drugs act by interfering with the cleaving of a single large polyprotein that produces individual structures and enzymatic proteins of the virus.
- Rhinoviruses are sensitive to low pH. In one recent study, citrate/phosphate buffers were administered intranasally, decreasing viral shedding but failing to decrease symptomatology.[11]
Diet
Dietary supplements have been touted as possible therapeutic or preventive measures.
- Although large doses of vitamin C have been used for prevention and treatment of colds, controlled trials reveal minimal therapeutic benefit and no preventive qualities.[12]
- Zinc has been found to inhibit rhinovirus replication in vitro, but no proven benefit has been shown in vivo on virus activity or immune modulation. A Cochrane Database Systemic Review of 13 therapeutic trials and two preventative trials determined that zinc administered within 24 hours of onset of symptoms reduces the duration and severity of the common cold in otherwise healthy individuals.[13] When administered for at least 5 months, zinc reduces cold incidence. However, zinc lozenges may have side effects, and recommended dosing, formulations, and duration are difficult to establish without further studies.
- The genus Echinacea consists of 3 species of plants used medicinally for their reported nonspecific stimulation of the immune system.
- Echinacea purpurea has recently been studied and did not show any differences in rates of infection or severity of illness when compared with placebo. Although reports of improved symptoms have been described, validation and standardization of products is necessary.[14]
- Echinacea angustifolia has also been examined in the prophylaxis and treatment of experimental rhinoviral infection. Neither the rate of infection nor the severity of symptoms were found to be statistically significantly affected when E angustifolia was used either prophylactically or at the time of challenge.[15]
- In contrast, a recent meta-analysis of echinacea indicated that, in properly designed studies, patients receiving placebo were 55% more likely to experience cold symptoms than patients taking echinacea. The most striking part of this meta-analysis was that 231 of 234 articles identified were excluded because they did not control for the type of viruses causing the colds. Echinacea extracts will continue to be evaluated.[16]
- A randomized, controlled trial of echinacea pills assessed the potential benefits as a treatment for the common cold.[17] The study included 719 patients, 713 of which completed the protocol. Illness duration and severity were not statistically significant for patients taking echinacea compared with those taking placebo.
Activity
Patients may limit their activity during the course of the infection, with clinical improvement occurring 48-72 hours after the prodrome of symptoms.
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