Africa ; epidemiology ; Escherichia coli Infections ; epidemiology ; Escherichia coli O157 ; Humans

To investigate the genomic properties of HIV-1, we collected 3,081 sequences from the HIV Sequence Database. The sequences were categorized according to sampling region, country, year, subtype, gene name, and sequence and were saved in a database constructed for this study. The relative synonymous codon usage (RSCU) values of matrix, capsid, and gp120 and gp41 genes were calculated using correspondence analysis. The synonymous codon usage patterns based on the geographical regions of African countries showed broad distributions; when all the other regions, including Asia, Europe, and the Americas, were taken into account, the Asian countries tended to be divided into two groups. The sequences were clustered into nine non-CRF subtypes. Among these, subtype C showed the most distinct codon usage pattern. To determine why the codon usage patterns in Asian countries were divided into two groups for four target genes, the sequences of the isolates from the Asian countries were analyzed. As a result, the synonymous codon usage patterns among Asian countries were divided into two groups, the southern Asian countries and the other Asian countries, with subtype 01_AE being the most dominant subtype in southern Asia. In summary, the synonymous codon usage patterns among the individual HIV-1 subtypes reflect genetic variations, and this bioinformatics technique may be useful in conjunction with phylogenetic methods for predicting the evolutionary patterns of pandemic viruses.
HIV-1/*genetics/*isolation & purification ; Gene Expression Regulation, Viral/*genetics ; Europe/epidemiology ; Codon/*genetics ; Asia/epidemiology ; Americas/epidemiology ; Africa/epidemiology

Acquired Immunodeficiency Syndrome ; complications ; epidemiology ; Africa ; epidemiology ; Clinical Trials as Topic ; Humans ; International Cooperation ; Neoplasms ; epidemiology ; etiology ; therapy ; Treatment Outcome

A low prevalence of Parkinson's disease (PD) has been reported in the Sub-Saharan Africa (SSA) region. The genetic causes and clinical features of PD in this region have been poorly described. Very few reports have examined the availability and access to evidence-based quality care for people living with PD in this region. We reviewed all publications focusing on idiopathic PD from SSA published up to May 2016 and observed a prevalence of PD ranging from 7/100,000 in Ethiopia to 67/100,000 in Nigeria. The most recent community-based study reported a mean age at onset of 69.4 years. The infrequent occurrence of mutations in established PD genes was also observed in the region. Treatments were non-existent or at best irregular. Additionally, there is a lack of well-trained medical personnel and multidisciplinary teams in most countries in this region. Drugs for treating PD are either not available or unaffordable. Large-scale genetic and epidemiological studies are therefore needed in SSA to provide further insights into the roles of genetics and other etiological factors in the pathogenesis of PD. The quality of care also requires urgent improvement to meet the basic level of care required by PD patients.
Africa South of the Sahara ; Age of Onset ; Epidemiologic Studies ; Epidemiology ; Ethiopia ; Genetics ; Humans ; Nigeria ; Parkinson Disease ; Prevalence

Africa ; epidemiology ; Asia, Southeastern ; epidemiology ; Carcinoma ; Epstein-Barr Virus Infections ; complications ; epidemiology ; virology ; Herpesvirus 4, Human ; pathogenicity ; Humans ; Middle East ; epidemiology ; Nasopharyngeal Neoplasms ; epidemiology ; etiology ; virology

The 2014 outbreak of Ebola virus disease (EVD) in West Africa, caused by Ebola virus (Zaire Ebola virus species), is the largest outbreak of EVD in history. It cause hemorrhagic fever in human and nonhuman primates with high mortality rate up to 90% and can be transmitted by direct contact with blood, body fluids, skin of EVD patients or persons who have died of EVD. As of December 17, 2014, 450 healthcare personnel are known to have been infected with Ebola, of whom 244 died. For development of Ebola vaccine and treatment are highly difficult due to its dangerous and accessibility that requires biosafety level 4 (BSL-4) to conduct experiment. Also there is no specific vaccine and treatment for Ebola virus; however, many candidate vaccines and antiviral-drugs such as ZMapp and TKM-Ebola are being developed for Ebola virus disease. In this review, we focus on the epidemiology of 2014 outbreak of Ebola virus and candidate agent for preventing and curing from Ebola virus.
Africa, Western* ; Body Fluids ; Delivery of Health Care ; Ebolavirus* ; Epidemiology ; Fever ; Hemorrhagic Fever, Ebola ; Humans ; Mortality ; Primates ; Skin ; Vaccines

Novel subtypes of Asian-origin (Goose/Guangdong lineage) H5 highly pathogenic avian influenza (HPAI) viruses belonging to clade 2.3.4, such as H5N2, H5N5, H5N6, and H5N8, have been identified in China since 2008 and have since evolved into four genetically distinct clade 2.3.4.4 groups (A–D). Since 2014, HPAI clade 2.3.4.4 viruses have spread rapidly via migratory wild aquatic birds and have evolved through reassortment with prevailing local low pathogenicity avian influenza viruses. Group A H5N8 viruses and its reassortant viruses caused outbreaks in wide geographic regions (Asia, Europe, and North America) during 2014–2015. Novel reassortant Group B H5N8 viruses caused outbreaks in Asia, Europe, and Africa during 2016–2017. Novel reassortant Group C H5N6 viruses caused outbreaks in Korea and Japan during the 2016–2017 winter season. Group D H5N6 viruses caused outbreaks in China and Vietnam. A wide range of avian species, including wild and domestic waterfowl, domestic poultry, and even zoo birds, seem to be permissive for infection by and/or transmission of clade 2.3.4.4 HPAI viruses. Further, compared to previous H5N1 HPAI viruses, these reassortant viruses show altered pathogenicity in birds. In this review, we discuss the evolution, global spread, and pathogenicity of H5 clade 2.3.4.4 HPAI viruses.
Africa ; Animals ; Asia ; Birds ; China ; Disease Outbreaks ; Epidemiology ; Europe ; Influenza in Birds* ; Japan ; Korea ; Poultry ; Reassortant Viruses ; Seasons ; Vietnam ; Virulence*

BACKGROUND: Endemic malaria has become increasingly rare since the late 1970s, but since the reemergence of indigenous vivax malaria in 1993, the number of cases of malaria have recently increased. We analyzed the cases of malaria who were treated in Kangnam St. Mary's Hospital with regards to epidemiology, clinical manifestations, and treatment outcome, and made a comparison between indigenous and imported cases. METHODS: We retrospectively analyzed data of 40 confirmed cases of malaria treated in the same hospital. RESULTS: Twenty-one cases were indigenous and 19 were imported malaria. Peripheral blood smear revealed Plasmodium vivax in all indigenous malaria, whereas in imported cases 13 were P. falciparum and 6 were P. vivax. Yeonchon-gun(7 cases) was the most prevalent area in the indigenous cases; Africa and Southeast Asia(7 cases, respectively) were the most prevalent areas in the imported cases. Anemia(hemoglobin <10g/dL) was found more frequently in the imported cases, but the difference was not statistically significant. One patient, who was infected in South America showed initially resistant to primaquine, but was cured after extended treatment with increased dosage of primaquine. CONCLUSION: As cases of indigenous malaria in Korea are increasing, early diagnosis, treament, and prevention of malaria are important. To prevent imported malaria, anyone who travels to endemic areas should receive proper education and chemoprophylaxis, considering the pattern of drug resistance.
Africa ; Chemoprevention ; Drug Resistance ; Early Diagnosis ; Education ; Epidemiology ; Humans ; Korea ; Malaria* ; Malaria, Vivax ; Plasmodium vivax ; Primaquine ; Retrospective Studies ; South America ; Treatment Outcome

Zaire Ebola virus (EBOV) is a fatal human pathogen, with a high case fatality rate (CFR) averaging up to 78%. In March 2014, the World Health Organization (WHO) was made aware of a ZEBOV outbreak in rural Guinea, West Africa. Epidemiologic investigation linked the clinical and laboratory confirmed cases with the presumed first fatality of the outbreak in December 2013. EBOV from Guinea is a separate clade from other ZEBOV strains reported from the Democratic Republic of Congo (DRC) and Gabon. Since the outbreak in March, ZEBOV was also reported in Conakry, Guinea's capital and spread to other neighboring countries. In its largest outbreak, ZEBOV disease expanded through Guinea, Liberia, Sierra Leone, and Nigeria and to Spain, the USA, and the UK. The WHO declared the 2013-2015 West African Ebola epidemic a public health emergency of international concern considering its presumable capacity for further international spread. Early manifestations of EVD (Ebola virus disease) include a high fever, body aches, malaise, and fatigue. Severe diarrhea and other gastrointestinal manifestations such as vomiting were common, while bleeding was a more sporadic finding. The fatality rate was 43% and highest in patients aged > or = 45 years and the overall fitted mean incubation period was 10.3 days (95% CI 9.9~10.7). We present a review of the literature on the emergence of Ebola, and the epidemiologic, clinical, and laboratory records of patients in whom EVD was diagnosed in Sierra Leone, Guinea, Liberia, Mali, the USA, and Spain, its zoonotic origin, and the transmission of ZEBOV, as well as presenting original literature on the current Ebola outbreak.
Africa, Western* ; Congo ; Diarrhea ; Ebolavirus ; Emergencies ; Epidemiology ; Fatigue ; Fever ; Gabon ; Guinea ; Hemorrhage ; Humans ; Liberia ; Mali ; Mortality ; Nigeria ; Public Health ; Sierra Leone ; Spain ; Vomiting ; World Health Organization

The number of people living with HIV/AIDS continues to grow, estimated to be 39.5 million as of the end of 2006, while 4.3 million people were newly infected in 2006. The proportions of women has continued to grow, currently approaching 50%. Sub-Saharan Africa continues to bear the brunt of global epidemic, comprising 63% of all infections worldwide. The most striking increases have occurred in East Asia, Eastern Europe, and Central Asia. High-risk behaviors (intravenous drug use and unprotected sex between men or with paid sex workers) are the predominant route of transmission. The number of people with HIV/AIDS continues to increase since the first report of HIV in Korea, now approaching 4,580 as of the end of 2006. The real magnitude of HIV epidemic is believed to be much larger than the recent estimates by UNAIDS shows (13,000 people with HIV infection). The prevalence among the general population is still low (less than 0.1%; probably 0.003~0.01%). The HIV epidemic in Korea shows several peculiar features: 1) a male predominance suggesting that the epidemic may still be largely confined to male homosexual community, while the transmission through heterosexual contact remains less prominent, 2) a conspicuous absence of contribution of intravenous drug use to current epidemic, and 3) a very small number of vertical transmission due to the relatively limited number of infected women. The HIV epidemic is expected to continue to grow in the foreseeable future in Korea as well as globally unless drastic efforts are made to cope with the epidemic.
Africa South of the Sahara ; Asia ; Epidemiology* ; Europe, Eastern ; Far East ; Female ; Heterosexuality ; HIV ; Homosexuality ; Humans ; Korea ; Male ; Prevalence ; Seroepidemiologic Studies ; Strikes, Employee ; Unsafe Sex