Summary. -Parvovirus B19 (B19V) is a small non-enveloped single-stranded DNA (ssDNA) virus of the family Parvoviridae, the subfamily Parvovirinae, the genus Erythrovirus and Human parvovirus B19 type species. It is a common community-acquired respiratory pathogen without ethnic, socioeconomic, gender, age or geographic boundaries. Moreover, the epidemiological and ecological relationships between human parvovirus B19, man and environment have aroused increasing interest in this virus. B19V infection is associated with a wide spectrum of clinical manifestations, some of which were well established and some are still controversial, however, it is also underestimated from a clinical perspective. B19V targets the erythroid progenitors in the bone marrow by binding to the glycosphingolipid globoside (Gb4), leading to large receptor-induced structural changes triggering cell death either by lysis or by apoptosis mediated by the nonstructural (NS)1 protein. The pattern of genetic evolution, its peculiar properties and functional profile, the characteristics of its narrow tropism and restricted replication, its complex relationship with the host and its ample pathogenetic potential are all topics that are far from a comprehensive understanding. The lack of efficient adaptation to in vitro cellular cultures and the absence of animal models have limited classical virological studies and made studies on B19V dependent on molecular biology. The present review looks at the nature of this virus with the view to provide more information about its biology, which may be useful to the present and future researchers.Keywords: human parvovirus B19; respiratory pathogen; biology; genome; fifth disease; transient aplastic crisis; anemia * Corresponding author. E-mail: rezaie@tums.ac.ir; phone: +982188982343. Abbreviations: B19V = parvovirus B19; Gb4 = glycosphingolipid globoside; IL-6 = interleukin 6; IVIG = intravenous immunoglobulin G; MHC = major histocompatibility class; SF3-helicase = superfamily 3 helicase; NS = nonstructural; TNF-α = tumor necrosis factor α; VLPs = virus like particles; VP1 = viral protein 1; VP2 = viral protein 2

Increased blood cytokines is the main immunopathological process that were attributed to severe clinical outcomes in cases of influenza A/H3N2 virus infection. The study was aimed to investigate the polymorphisms of IL-1β, IL-10, IL-17, and IL-28 genes to find the possibility of their association with the clinical outcome of influenza A/H3N2 virus infection among the infected patients in Iran. This is a Case-Control study in which influenza A/H3N2 virus positive confirmed with real-time PCR were the cases. DNA samples from groups were genotyped for polymorphisms in rs16944 (IL-1β), rs1800872 (IL-10), rs2275913 (IL-17), and rs8099917 (IL-28). Confidence interval (95%CI) and Odds ratio (OR) were calculated. IL-17 rs2275913 (GG and AG) were associated with risk of infection with that were statistically significant (P < 0.05, OR = 2.08-2.94). IL-1β (rs16944) (GG) was associated with reduced risk of infection (P < 0.01, OR = 0.46). Genotype GG and GT of IL-10 (rs1800872) were associated with increased risk of infection with influenza A/H3N2 virus (P < 0.05, OR = 2.04-2.58). In addition, IL-28 (rs8099917) genotypes GG (P < 0.05, OR = 0.49) and TG (P < 0.05, OR = 0.59) were associated with reduced risk of ILI symptom while genotype TT (P < 0.01, OR = 4.31) was associated with increased risk of ILI symptom. The results of this study demonstrated that polymorphisms of genes involved in the inflammatory and anti-inflammatory process affect the outcome of disease caused by influenza A/H3N2 virus. Thorough insight on host immune response at the time of influenza A virus infection is required to ensure adequate patient care in the case of feature outbreaks. J. Med. Virol. 88:2078-2084, 2016. © 2016 Wiley Periodicals, Inc.

A comparative preliminary study on the phytochemistry and antibacterial effects of ethanolic and aqueous extracts of the leaves and latex of Calotropis procera on four pathogenic clinical bacterial isolates namely Escherichia coli, Staphylococcus aureus, Salmonella species and Pseudomonas species was carried out using paper-disc diffusion and broth dilution techniques. The results obtained revealed that ethanol was the best extractive solvent for a fraction with antibacterial properties of the C. procera leaves and latex. Generally, the aqueous extracts showed no activity on the isolates. The minimum inhibitory concentration (MIC) for the leaf ethanolic extract was 1000 -2000 µg/ml while the minimum bactericidal concentration (MBC) of the latex ethanolic extract was 2000 µg/ml. Phytochemical analysis of the leaf and latex extracts showed the presence of tannins, steroids, saponins and flavonoids while alkaloids were absent in both extracts. Generally, the antibacterial effects of the plant parts revealed that the leaf extracts had stronger activity in comparison with those of the latex.

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Objective: Human Immunodeficiency Viral infection and Protein Energy Malnutrition (PEM) are highly prevalent in Nigeria and when they occur together, the outcome is usually severe as both conditions lead to immune suppression. HIV alone accounts for 14.0% of childhood mortality even though children constitute only 6% of global HIV infection burden. The objective of the study was to determine the prevalence of HIV infection among malnourished children below 5 years in Kano State, Nigeria. Methods: A total of 400 malnourished children were randomly selected and tested for the presence of HIV I & II using parallel ELISA rapid test kits, Stat park and Determine (both immunochromatographic techniques). Findings: Thirty-one samples were found to be positive to HIV 1 giving a prevalence of 7.8%. There was no statistically significant difference between sexes when male to female ratio was 1:1.3 and peak age of presentation was 2-3 years. Sixty-four percent (64.0%) were presented with severe form of HIV infection (stage 4) according to WHO paediatric HIV clinical stage and about half of them came with marasmus by the Wellcome classification of malnutrition. There was no significant association between the type of malnutrition and the severity of HIV infection at present, (p value > 0.05). The commonest signs and symptoms were oral candidiasis (67.7%), lymphadenopathy (44.0%), fever (64.5%) and cough (54.8%). Sixty-four percent of the children were from polygamous families. There was a significant statistical correlation between polygamy and incidence of HIV infection, (p < 0.01). Only 45.0% of the women were aware of their HIV status prior to this study. Seventy-four percent (74.0%) of those who were aware of their status had no knowledge of the prevention of mother to child transmission (PMTCT) services and even for those who were aware, none of them accessed the care. Conclusion: A population based HIV screening is therefore recommended while perinatal HIV screening and PMTCT services need to be expanded.