scholarly journals Serodiagnosis of Crimean-Congo haemorrhagic fever

1994 ◽  
Vol 113 (3) ◽  
pp. 551-562 ◽  
Author(s):  
F. J. Burt ◽  
P. A. Leman ◽  
J. C. Abbott ◽  
R. Swanepoel
Keyword(s):  
Early Detection ◽  
Sandwich Elisa ◽  
Acute Stage ◽  
Similar Proportion ◽  
Antibody Activity ◽  
Haemorrhagic Fever ◽  
Serum Samples ◽  
Igg Antibody ◽  
If Technique ◽  
Crimean Congo Haemorrhagic Fever

SUMMARYSeveral methods for demonstrating antibody to Crimean-Congo haemorrhagic fever virus were compared on serum samples taken from 101 patients during the acute stage of illness and at intervals for up to 59 months thereafter, with emphasis on early detection of the immune response. The deaths of 23 patients on days 5–14 of illness were ascribed to the effects of the disease; two patients died later from other causes. Very few of the patients who died from the acute illness mounted an antibody response detectable by the methods tested. Four patients who died and 18 who recovered were treated with immune plasma collected from recovered patients. Treated patients acquired IgG antibody from the plasma, but it was possible to discern the onset of an endogenous IgM response in those individuals who survived the disease by all of the methods tested. Indirect immunofluorescence (IF) tests detected IgM and/or IgG antibodies at the earliest on day 4 of illness in about 10% of patients who survived the disease, and by day 9 all survivors had antibodies demonstrable by IF. A biotin-streptavidin IF technique offered no advantage over the standard IF test for the early detection of IgG antibody, but demonstrated higher antibody titles and detected IgM antibody earlier in about a quarter of the patients tested. An IgM-capture enzyme-linked immunoassay (ELISA) and an IgG sandwich ELISA demonstrated higher antibody titres than did IF tests, and detected antibody responses at an earlier stage of infection than did IF tests in about one-fifth of patients, but the reverse was true in a similar proportion of instances. A competition ELISA, which detected total antibody activity, produced lower titres than did the IgM and IgG ELISAs, but yielded results which were in close agreement with the findings in IF tests. It was concluded that the IF tests were most convenient for use in making a rapid serodiagnosis of the disease.

scholarly journals Enzyme-linked immunosorbent assays for the detection of antibody to Crimean-Congo haemorrhagic fever virus in the sera of livestock and wild vertebrates

1993 ◽  
Vol 111 (3) ◽  
pp. 547-558 ◽  
Author(s):  
F. J. Burt ◽  
R. Swanepoel ◽  
L. E. O. Braack
Keyword(s):  
Specific Binding ◽  
Sandwich Elisa ◽  
Infected Sheep ◽  
Antibody Activity ◽  
Haemorrhagic Fever ◽  
Igg Antibody ◽  
Igm Antibody ◽  
Cchf Virus ◽  
Crimean Congo Haemorrhagic Fever ◽  
Peroxidase Conjugate

SummaryIgM antibody response to Crimean-Congo haemorrhagic fever (CCHF) virus was monitored in experimentally infected sheep and cattle by an IgM capture enzyme-linked immunoassay (ELISA). Specific binding of antigen was detected by a rabbit anti-CCHF horseradish peroxidase conjugate or a sandwich technique with hyperimmune mouse anti-CCHF ascitic fluid and commercially available anti-mouse immunoglobulin peroxidase conjugate. The persistence of IgM antibody activity was found to be of shorter duration than in humans, and this may be a function of the relative lack of susceptibility of these animals to infection with CCHF virus. IgG antibody responses in the sheep could be monitoried by sandwich ELISA using commercially available anti-sheep immunoglobulin peroxidase conjugates. Total antibody activity in the sera of experimentally infected sheep, cattle and small mammals could be monitored in a competitive ELISA (CELISA) using rabbit anti-CCHF peroxidase conjugate. The CELISA was applied to the sera of 960 wild vertebrates from a nature reserve in South Africa, and the prevalence of antibody was found to be greatest in large mammals such as rhinoceros, giraffe and buffalo, which are known to be the preferred hosts of the adult tick (Hyalomma) vectors of the virus.

scholarly journals Investigation of tick-borne viruses as pathogens of humans in South Africa and evidence of Dugbe virus infection in a patient with prolonged thrombocytopenia

1996 ◽  
Vol 116 (3) ◽  
pp. 353-361 ◽  
Author(s):  
F. J. Burt ◽  
D. C. Spencer ◽  
P. A. Leman ◽  
B. Patterson ◽  
R. Swanepoel
Keyword(s):  
South Africa ◽  
Febrile Illness ◽  
Cross Reactivity ◽  
Distribution Range ◽  
Antibody Activity ◽  
Haemorrhagic Fever ◽  
Serum Samples ◽  
Viral Haemorrhagic Fever ◽  
Cchf Virus ◽  
Crimean Congo Haemorrhagic Fever

SUMMARYIn the course of investigating suspected cases of viral haemorrhagic fever in South Africa patients were encountered who had been bitten by ticks, but who lacked evidence of infection with Crimean–Congo haemorrhagic fever (CCHF) virus or non-viral tick-borne agents. Cattle sera were tested by enzyme-linked immunoassay to determine whether tick-borne viruses other than CCHF occur in the country. The prevalence of antibody in cattle sera was 905/2116 (42·8%) for CCHF virus, 70/1358 (5·2%) for Dugbe, 21/1358 (1·5%) for louping ill, 6/450 (1·3%) for West Nile, 7/1358 (0·5%) for Nairobi sheep disease, 3/625 (0·5%) for Kadam and 2/450 (0·4%) for Chenuda. No reactions were recorded with Hazara, Bahig, Bhanja, Thogoto and Dhori viruses. The CCHF findings confirmed previous observations that the virus is widely prevalent within the distribution range of ticks of the genusHyalomma, while antibody activity to Dugbe antigen was detected only within the distribution range of the tickAmblyomma hebraeum. Cross-reactivity for the nairoviruses, Hazara, Nairobi sheep disease and Dugbe, was detected in serum samples from 3/72 human patients with confirmed CCHF infection, and serum from 1/162 other patients reacted monospecifically with Dugbe antigen. The latter patient suffered from febrile illness with prolonged thrombocytopenia.

scholarly journals Hemoglobin-Specific Antibody in a Multiply Transfused Patient With Sickle Cell Disease

Blood ◽  
1997 ◽  
Vol 89 (6) ◽  
pp. 2155-2158 ◽  
Author(s):  
Peter A. Noronha ◽  
Loyda N. Vida ◽  
C. Lucy Park ◽  
George R. Honig
Keyword(s):  
Sickle Cell Disease ◽  
Sickle Cell ◽  
Solid Phase ◽  
Enzyme Linked Immunosorbent Assay ◽  
Antibody Activity ◽  
Cell Disease ◽  
Serum Samples ◽  
Igg Antibody ◽  
Microtiter Plates ◽  
Level Of Activity

Abstract Human hemoglobins (Hbs) are known to be immunogenic, and both normal and variant forms of Hb have been shown to stimulate antibody formation in a variety of animal species. In patients who are homozygous for the sickle Hb (HbS) mutation, transfusion of normal, HbA-containing erythrocytes provides a potential stimulus for HbA alloimmunization. We tested serum samples for the presence of anti-Hb antibody by a solid-phase enzyme-linked immunosorbent assay (ELISA) using Hb-coated polystyrene microtiter plates. Hb-bound antibody was identified using an antihuman IgG antibody. Serum samples from 89 patients with sickle cell disease were initially tested for evidence of Hb antibody. The serum from three individuals exhibited antibody activity against HbA with little or no activity against HbS. Only one of them, a multiply transfused adult with HbSS, was available for further study. When this patient's antibody was tested against a variety of normal and mutant Hbs using antibody either to human IgG or to κ chains, the anti-Hb antibody demonstrated specificity for the region of the Hb β chain corresponding to the site of the amino acid substitution of HbS. The level of activity of the patient's anti-HbA showed no significant change over 1.5 years of observation. The transfusion of erythrocytes containing Hb structurally different from that of the recipient appeared to be capable of stimulating the production of Hb-specific alloimmune antibody.

Detection of IgG antibody against Crimean-Congo haemorrhagic fever virus using ELISA with recombinant nucleoprotein antigens from genetically diverse strains

2013 ◽  
Vol 142 (10) ◽  
pp. 2147-2154 ◽  
Author(s):  
A. RANGUNWALA ◽  
R. R. SAMUDZI ◽  
F. J. BURT
Keyword(s):  
Amino Acid ◽  
South African ◽  
Cross Reactivity ◽  
Molecular Techniques ◽  
Fever Virus ◽  
Amino Acid Difference ◽  
Haemorrhagic Fever ◽  
Igg Antibody ◽  
Recombinant Antigens ◽  
Crimean Congo Haemorrhagic Fever

SUMMARYCrimean-Congo haemorrhagic fever virus (CCHFV) has the propensity to cause nosocomial infections with a high fatality rate. Handling the virus requires biosafety level-4 facilities, limiting accessibility for many laboratories. Advances in molecular techniques have allowed preparation of safe recombinant antigens that have application in diagnosis and serosurveillance of CCHFV. The aim of this study was to determine genetic diversity in CCHFV based on all available complete sequence data for the S gene encoding CCHFV nucleoprotein (NP) and antibody cross-reactivity between the NP of a South African isolate and the NP of a Greek isolate (AP92), the most genetically diverse CCHFV strain. The nucleotide sequence diversity and amino-acid diversity between genotypes, within genotypes and the pairwise distances were calculated for a dataset of 45 CCHFV isolates retrieved from GenBank. The most diverse virus, AP92, isolated from a tick in Greece, displayed the highest amino-acid difference (8·7%) with SPU415/85, isolated from a human infection in South Africa. Recombinant NP encoded for by codon-optimized S genes of SPU415/85 and AP92 were expressed in a bacterial host system and used to develop an in-house ELISA to detect IgG antibody against CCHFV in South African patients who survived infection. A total of 14/14 sera reacted with the South African recombinant NP and 13/14 reacted with the Greek recombinant NP. The serological cross-reactivity of the two NP antigens suggests that recombinant antigens prepared from geographically distinct CCHFV will have diagnostic and epidemiological applications worldwide.

Identification of human linear B-cell epitope sites on the envelope glycoproteins of Crimean-Congo haemorrhagic fever virus

2014 ◽  
Vol 143 (7) ◽  
pp. 1451-1456 ◽  
Author(s):  
D. GOEDHALS ◽  
J. T. PAWESKA ◽  
F. J. BURT
Keyword(s):  
B Cell ◽  
Cell Epitope ◽  
Fever Virus ◽  
Enzyme Linked Immunosorbent Assay ◽  
Haemorrhagic Fever ◽  
Serum Samples ◽  
B Cell Epitope ◽  
Crimean Congo Haemorrhagic Fever ◽  
Peptide G ◽  
Linear B

SUMMARYA peptide library was used to screen for regions containing potential linear B-cell epitope sites in the glycoproteins and nucleoprotein of Crimean-Congo haemorrhagic fever virus (CCHFV) in an enzyme-linked immunosorbent assay (ELISA). The library consisted of 156 peptides, spanning the nucleoprotein and mature GN and GC proteins in a 19-mer with 9-mer overlap format. Using pooled serum samples from convalescent patients to screen the library, six peptides were identified as potential epitope sites. Further testing of these six peptides with individual patient sera identified two of these peptides as probable epitope sites, with peptide G1451–1469 reacting to 13/15 and peptide G1613–1631 to 14/15 human sera. These peptides are situated on the GC protein at amino acid positions 1451–1469 (relative to CCHFV isolate SPU103/97) (TCTGCYACSSGISCKVRIH) and 1613–1631 (FMFGWRILFCFKCCRRTRG). Identified peptides may have application in ELISA for diagnostic or serosurveillance purposes.

scholarly journals Monitoring Crimean-Congo haemorrhagic fever virus RNA shedding in body secretions and serological status in hospitalised patients, Turkey, 2015

2020 ◽  
Vol 25 (10) ◽  
Author(s):  
Dilek Yagci-Caglayik ◽  
Bircan Kayaaslan ◽  
Derya Yapar ◽  
Aysel Kocagul-Celikbas ◽  
Aslinur Ozkaya-Parlakay ◽  
...  
Keyword(s):  
Case Series ◽  
Balkan Peninsula ◽  
Body Fluids ◽  
Viral Rna ◽  
Transmission Risk ◽  
Whole Body ◽  
Haemorrhagic Fever ◽  
Serum Samples ◽  
Hospitalised Patients ◽  
Crimean Congo Haemorrhagic Fever

Introduction Crimean-Congo haemorrhagic fever (CCHF) is a tick-borne disease in Africa, Asia, the Balkan peninsula, the south-east of Europe and the Middle East, with mortality rates of 3–30%. Transmission can also occur through contact with infected animals or humans. Aim This observational, prospective case series aimed to investigate detectable viral genomic RNA in whole-body fluids and antibody dynamics in consecutive daily samples of patients diagnosed with CCHF until discharge from hospital. Methods We tested 18 patients and 824 swabs and sera with RT-PCR and 125 serum samples serologically. Results The longest duration until clearance of viral RNA was 18 days from serum collection and 18, 15, 13, 19 and 17 days, respectively, from nasal, oral, genital (urethral or vaginal) and faecal swab, and urine. In seven patients, viral load decreased in serum at the same time as it increased in urine or persisted at the same logarithmic values. Despite clearance in serum, viral RNA was detected in faeces and genital swabs in two and three patients, respectively. Viral clearance from body fluids occurred earlier than from serum in eight patients on ribavirin treatment. The shortest seroconversion time was 3 days after symptom onset for IgM and IgG. Seroconversion of IgG occurred until Day 14 of symptoms. Conclusion We report persistence of viral RNA in urine, faeces and genital swabs despite serum clearance. This may indicate a need for extending isolation precautions, re-evaluating discharge criteria and transmission risk after discharge, and considering oral swabs as a less invasive diagnostic alternative.

Crimean-Congo haemorrhagic fever - the emerging vector-borne disease

2008 ◽  
Vol 63 (4) ◽  
pp. 1-7
Author(s):  
Krzysztof Kostro ◽  
Dorota Luft-Deptuła ◽  
Zdzisław Gliński
Keyword(s):  
Haemorrhagic Fever ◽  
Vector Borne Disease ◽  
Crimean Congo Haemorrhagic Fever ◽  
Vector Borne

scholarly journals Knowledge, attitude and perceptions about Crimean Congo Haemorrhagic Fever (CCHF) among occupationally high-risk healthcare professionals of Pakistan

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Ali Ahmed ◽  
Muhammad Saqlain ◽  
Maria Tanveer ◽  
Azhar Hussain Tahir ◽  
Fakhar Ud-Din ◽  
...  
Keyword(s):  
At Risk ◽  
Health Care Professionals ◽  
Work Experience ◽  
Tertiary Care ◽  
Nosocomial Transmission ◽  
Haemorrhagic Fever ◽  
Sources Of Information ◽  
Validated Questionnaire ◽  
Low Middle Income Countries ◽  
Crimean Congo Haemorrhagic Fever

Abstract Background Crimean Congo Haemorrhagic Fever (CCHF), a tropically neglected infectious disease caused by Nairovirus, is endemic in low middle-income countries like Pakistan. Emergency health care professionals (HCPs) are at risk of contracting nosocomial transmission of CCHF. We, therefore, aim to analyze the knowledge, attitudes, and perceptions (KAP) of at-risk physicians, nurses, and pharmacists in Pakistan and the factors associated with good KAP. Method A validated questionnaire (Cronbach’s alpha 0.71) was used to collect data from HCPs in two CCHF endemic metropolitan cities of Pakistan by employing a cross-sectional study design. For data analysis percentages, chi-square test and Spearman correlation were applied by using SPSS version 22. Results Of the 478 participants, 56% (n = 268) were physicians, 37.4% (n = 179) were nurses, and 6.5% (n = 31) were pharmacists. The proportion of HCPs with good knowledge, attitude, and perception scores was 54.3%, 81, and 69%, respectively. Being a physician, having more work experience, having a higher age, working in tertiary care settings, were key factors for higher knowledge (p < 0.001). The correlation coefficient showed significant positive correlation between attitude- perception (r = 0.560, p < 0.001). Conclusion We have observed average knowledge of HCPs. Therefore, we recommend time to time education campaigns and workshops in highly endemic CCHF regions to be launched by health ministries and HCPs, in particular nurses, encouraged to follow authentic academic sources of information to prevent nosocomial transmission.

scholarly journals Non-Invasive Dengue Diagnostics—The Use of Saliva and Urine for Different Stages of the Illness

Diagnostics ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1345
Author(s):  
Mahathir Humaidi ◽  
Wei Ping Tien ◽  
Grace Yap ◽  
Choon Rong Chua ◽  
Lee Ching Ng
Keyword(s):  
Clinical Symptoms ◽  
Detection Algorithm ◽  
Acute Stage ◽  
Serum Samples ◽  
Non Invasive ◽  
Fever Onset ◽  
Dengue Transmission ◽  
Dengue Diagnostics ◽  
Potential Tool

Dengue diagnosis is largely dependent on clinical symptoms and routinely confirmed with laboratory detection of dengue virus in patient serum samples collected via phlebotomy. This presents a challenge to patients not amenable to venipuncture. Non-invasive methods of dengue diagnosis have the potential to enhance the current dengue detection algorithm. In this study, samples from dengue infected patients were collected between January 2012 until September 2012 and September 2013 until December 2013 in two different setups. Panel A samples (blood, urine, and saliva) were collected daily when the 39 patients were hospitalised and during their follow-up visits while Panel B samples (saliva) were collected from 23 patients during the acute stage of dengue. Using DENV PCR on Panel A, from day 2 to day 4 post fever onset, serum showed the best overall positivity followed by saliva and urine (100%/82.1%/67.9%). From day 5 until day 10 post fever onset, serum and urine had similar positivity (67.4%/61.2%), followed by saliva (51.3%). Beyond day 10 post fever onset, DENV was undetectable in sera, but urine and saliva showed 56.8% and 28.6% positivity, respectively. DENV in urine was detectable up until 32 days post fever. Panel B results showed overall sensitivity of 32.4%/36% (RNA/NS1) for DENV detection in saliva. Our results suggest that the urine-based detection method is useful especially for late dengue detection, where DENV is undetected in sera but still detectable in urine. This provides a potential tool for the physician to pick up new cases in an area where there is ongoing dengue transmission and subsequently prompt for intensified vector control activities.

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