| Haemophilus seminalis |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Pseudomonadota (Proteobacteria), Class Gammaproteobacteria, Order Pasteurellales, Family Pasteurellaceae, Genus
Haemophilus, Haemophilus seminalis Zheng et al. 2020.
Haemophilus, Haemophilus seminalis Zheng et al. 2020.
Gram-negative, coccobacilli or rods, 0.4-0.8 x 0.6-1.8 µm, without any filaments or
capsule. Non-motile. Non-acid-fast.
capsule. Non-motile. Non-acid-fast.
Colonies are smooth, low, convex, greyish and translucent on Haemophilus
chocolate 2 agar. Growth occurs at 28-40 °C (optimum, 32-37 ºC.) and is enhanced in
the presence of CO2. Not haemolytic on blood agar (one strain reported positive).
Requires V factor for growth, but not X factor. Good growth on Haemophilus chocolate
2 agar and chocolate agar +PolyVitex, but not on Columbia blood agar, MacConkey
agar, BHI agar, CHAB agar, MH agar or lysogeny broth agar. Facultatively anaerobic.
chocolate 2 agar. Growth occurs at 28-40 °C (optimum, 32-37 ºC.) and is enhanced in
the presence of CO2. Not haemolytic on blood agar (one strain reported positive).
Requires V factor for growth, but not X factor. Good growth on Haemophilus chocolate
2 agar and chocolate agar +PolyVitex, but not on Columbia blood agar, MacConkey
agar, BHI agar, CHAB agar, MH agar or lysogeny broth agar. Facultatively anaerobic.
Isolated from human semen and sputum specimens in China.
Susceptible to sulbactam/ampicillin, amoxycillin/clavulanic acid, piperacillin, piperacillin/tazobactam, cefotaxime, ceftriaxone,
cefuroxime sodium, cefepime, ceftazidime, cefixime, aztreonam, meropenem, imipenem, azithromycin, ciprofloxacin, levofloxacin
chloramphenicol and rifampin, intermediate to ampicillin and resistant to cefaclor and tetracycline.
Susceptible to sulbactam/ampicillin, amoxycillin/clavulanic acid, piperacillin, piperacillin/tazobactam, cefotaxime, ceftriaxone,
cefuroxime sodium, cefepime, ceftazidime, cefixime, aztreonam, meropenem, imipenem, azithromycin, ciprofloxacin, levofloxacin
chloramphenicol and rifampin, intermediate to ampicillin and resistant to cefaclor and tetracycline.
Opportunistic pathogen.
- Zheng ML, Li LH, Liu B, Lin YB, Zhang XT, Chen C, Qu PH, Zeng J. Haemophilus seminalis sp. nov., isolated from human semen.
Int J Syst Evol Microbiol 2020; 70:2581-2588. - Chen X, et al. (2023) Comparative Genomic Analysis Reveals Genetic Diversity and Pathogenic Potential of Haemophilus
seminalis and Emended Description of Haemophilus seminalis. Microbiology spectrum, 11(4), e0477222.
Positive results for acid and alkaline phosphatase, catalase, leucine arylamidase, nitrate reduction, naphthol-AS-BI-
phosphohydrolase, oxidase, urease, acid production from: D-glucose and sucrose.
Negative results for arginine dihydrolase, cystine arylamidase, Simmons’ citrate, aesculin hydrolysis, esterase (C4), esterase lipase
(C8), alpha-fucosidase, gelatinase, alpha- and beta-galactosidase, beta-glucuronidase, alpha- and beta-glucosidase, gamma-
glutamyl transferase, H2S production from sodium thiosulfate, indole production, lysine decarboxylase, lipase (C14), N-acetyl-
betaglucosaminidase, alpha-mannosidase, ornithine decarboxylase, proline arylamidase, tryptophane decarboxylase, trypsin
arylamidase, alpha-chymotrypsin, valine arylamidase, Voges-Proskauer test, acid production from: D-fructose and maltose.
phosphohydrolase, oxidase, urease, acid production from: D-glucose and sucrose.
Negative results for arginine dihydrolase, cystine arylamidase, Simmons’ citrate, aesculin hydrolysis, esterase (C4), esterase lipase
(C8), alpha-fucosidase, gelatinase, alpha- and beta-galactosidase, beta-glucuronidase, alpha- and beta-glucosidase, gamma-
glutamyl transferase, H2S production from sodium thiosulfate, indole production, lysine decarboxylase, lipase (C14), N-acetyl-
betaglucosaminidase, alpha-mannosidase, ornithine decarboxylase, proline arylamidase, tryptophane decarboxylase, trypsin
arylamidase, alpha-chymotrypsin, valine arylamidase, Voges-Proskauer test, acid production from: D-fructose and maltose.
(c) Costin Stoica
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