Table. HI and MN antibody titers for influenza A(H7N7) virus and other H7 subtype viruses in serum samples of 5 men, Italy, 2013*.
| Person ID and phase type† | Age, y | Activity of person | Date of sample collection | Virus strain (subtype) and titer |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A/It/3/2013 (H7N7) |
A/Tk/It/3889/ 1999 (H7N1) |
A/Tk/It/214845/ 2002 (H7N3) |
A/Ck/It/2837-54/2007 (H7N3) |
|||||||||||
| HI | MN | HI | MN | HI | MN | HI | MN | |||||||
| 1 | ||||||||||||||
| Acute | 51 |
PW, culling |
Sep 6 | 10 | <10 | <10 | <10 | <10 | <10 | <10 | <10 | |||
| Convalescent |
Dec 6 |
20
|
35
|
|
<10 |
<10 |
|
<10 |
<10 |
|
<10 |
<10 |
||
| 2 | ||||||||||||||
| Acute | 46 |
Culling |
Sep 6 | 10 | <10 | <10 | <10 | <10 | <10 | <10 | <10 | |||
| Convalescent |
Dec 11 |
20
|
62
|
|
<10 |
<10 |
|
<10 |
<10 |
|
<10 |
<10 |
||
| 3 | ||||||||||||||
| Acute | 49 |
Culling |
Sep 7 | <10 | <10 | <10 | NT | <10 | NT | <10 | NT | |||
| Convalescent |
Dec 23 |
10
|
87
|
|
<10 |
<10 |
|
<10 |
<10 |
|
<10 |
<10 |
||
| FO10‡ | 34 | Culling | Dec 23 | 20 | 72 | <10 | <10 | <10 | <10 | <10 | <10 | |||
| RA32‡ | 55 | PW, culling | Dec 11 | 20 | 33 | <10 | <10 | <10 | <10 | <10 | <10 | |||
*Bold indicates titers of seropositive persons (HI positive results confirmed 3 times by MN). Values for 1 of 3 MN assays that showed similar results are reported. Seropositive persons were selected from 93 persons who participated in the study among 140 persons involved in culling activities. HI, hemagglutination inhibition; ID, identification; MN, microneutralization; NT, not tested; PW, poultry worker. †Persons 1, 2, and 3 had laboratory-confirmed cases of conjunctivitis caused by infection with influenza A(H7N7) virus. ‡Asymptomatic person.