Therapeutic Paint of Cidofovir/Sucralfate Gel Combination Topically Administered by Spraying for Treatment of orf virus Infections

Abstract

The aim of the research was to study a new cidofovir/sucralfate drug product to be used as a spray for treating the mucosal and/or skin lesions. The product, i.e., a water suspension of sucralfate (15% w/w) and cidofovir (1% w/w), combines the potent antiviral activity of the acyclic nucleoside phosphonate cidofovir ((S)-1-[3-hydroxy-2-(phosphonomethoxy)propyl]cytosine) and the wound healing properties of sucralfate gel (sucrose octasulphate basic aluminum salt). The product was characterized in vitro with respect to compatibility between drug and carrier, spray particle size, spray deposition, drying kinetics, and drug content and release. An interaction between the two active substances was found. The interaction between sucralfate and cidofovir was counteracted by introducing sodium dihydrogen phosphate (16% w/w) in the preparation. The spray formulation containing cidofovir/sucralfate gel painted the skin and dried quickly to a scab, remaining firmly adhered to the lesions. The therapeutic paint was tested in vivo on lambs infected with orf virus by treating the animals with different cidofovir/sucralfate formulations (0.5% or 1% cidofovir + sucralfate 15% + NaH(2)PO(4) 16% w/w) and with sucralfate gel suspension alone as control. The treatment with formulations containing cidofovir and phosphate salt for four consecutive days resulted in a rapid resolution of the lesions, with scabs containing significantly lower amounts of viable virus when compared with untreated lesions and lesions treated with sucralfate suspension alone.

Orf virus infection in sheep or goats

“…Cidofovir has been tried as an anti-Orf virus for treatment of human Orf, with promising results, although current costs can be prohibitive for using it in lambs (De Clercq, 2002;Dal Pozzo et al, 2007). An experimental preparation containing sucralfate and cidofovir, in spray form, was shown to have efficacy in lambs, as it combined the antiviral activity of cidofovir and the wound healing properties of sucralfate (Sonvico et al, 2009).…”

Orf: an update on current research and future perspectives

“…Furthermore, cidofovir was also shown to reduce the amount of viable virus found in the lesions and thus could be critical to reducing the incidence of disease on farms that have a persistent problem with orf [159]. Recently, a spray formulation containing cidofovir/sucralfate gel was tested in vivo on lambs infected with ORFV; this gel proved to be active against the virus and was easy to use for the treatment of a large number of animals in the field [160].…”

Microbial diseases of the genital system of rams or bucks

“…Antinucleoside phosphonates, especially cidofovir, can be effective (De Clercq, 2002;Dal Pozzo et al, 2007), whilst use of a combination of cidofovir and sucralfate has also been proposed (Sonvico et al, 2009). …”