Reduced airborne transmission of oseltamivir-resistant pandemic A/H1N1 virus in ferrets.

Abstract:

BACKGROUND:The H275Y neuraminidase mutation conferring oseltamivir resistance has been reported in several pandemic A/H1N1 (pH1N1) isolates. We sought to evaluate transmission of this mutant virus through the direct contact and the airborne (aerosol and droplet) routes in the ferret model. METHODS:Groups of four ferrets were infected with either wild-type (WT) or oseltamivir-resistant pH1N1 (H275Y) strains. At 24 h following viral infection, a receptive ferret was introduced in the same cage as the infected animal to assess direct contact transmission. For the airborne transmission, naive ferrets were placed in a modified separate cage adjacent to that of their respective index ferret. RESULTS:The H275Y mutant virus was as efficiently transmitted as the WT strain by direct contact, as 100% (4/4) of contact ferrets in both groups seroconverted and shed virus. Mean peak viral titres were similar in both groups (4 × 10(4) and 2.63 × 10(4) plaque-forming units/ml after WT or H275Y mutant virus transmission, respectively). Peak viral shedding occurred on day 2 post-contact for the WT group and on day 4 post-contact for the H275Y mutant group. By contrast, airborne transmission of the mutant strain was less efficient, as only 25% (1/4) of contact ferrets seroconverted and shed virus, whereas 100% (4/4) of the WT ferrets did. Peak of viral replication was delayed compared to direct contact transmission and occurred on day 4 post-contact. CONCLUSIONS:Transmission of the H275Y pH1N1 mutant strain by the airborne route is somewhat compromised, which may limit its widespread dissemination.

journal_name

Antivir Ther

journal_title

Antiviral therapy

authors

Hamelin ME,Baz M,Bouhy X,Beaulieu E,Dubé K,Mallett C,Boivin G

doi

10.3851/IMP1794

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

775-9

issue

5

eissn

1359-6535

issn

2040-2058

journal_volume

16

pub_type

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