Increasing evidence suggests that some newly emerged SARS-CoV-2 variants of concern (VoCs) resist neutralization by antibodies elicited the early-pandemic wild-type virus. We applied tests to paired recoveree sera (n = 38) using clinical isolates representing first wave (D614G), VoC1, and VoC2 lineages (B.1.1.7 B 1.351). Neutralizing inhibited contemporary VoC1 lineages, whereas inhibition was ...

Representatives of two species, the chicken and the goat, were immunized by injection with Freund's adjuvant, of specific precipitates prepared from the antisera of rabbits with various allotypic specificities. The precipitation reactions of the resulting antisera with normal rabbit sera were studied in liquid and in gellified media. In these reactions the isotypic specificity and often one or ...

background: the aim of this study was using elisa for detection of anti- schistosoma haemato­bium antibodies in both sera and urine of patients with urinary schistosomiasis. methods: thirty three sera and urine samples were collected from patients with acute schisto­somi­asis in diyala province, east of iraq in 2006.   their diseases were confirmed by find­ing   s. haematobium ova in urine exam...

Platelet aggregation indicating antigen-antibody complex formation was observed when hepatitis B surface (HBs) antigen and antibody were mixed. Platelet aggregation titers were determined for serum specimens found positive by radioimmunoassay for either HBs antigen or HBs antibody. From these determinations, incidence of HBs antigen-antibody complexes was found to be higher in HBs antigen seraa...

The levels of cysteine proteinase inhibitors stefin A, stefin B, and cystatin C were determined using ELISAs in sera obtained preoperatively from 345 patients with colorectal cancer and in control sera from 125 healthy blood donors. The levels of stefin A and cystatin C were found to be moderately increased in patient sera (1.4-fold and 1.6-fold, respectively; P < 0.0001), whereas the level of ...

Five serological assays were evaluated for the diagnosis of brucellosis in goats: the rose bengal test (RBT), complement fixation test (CFT), radial immunodiffusion (RID) with Brucella and Yersinia enterocolitica O:9 polysaccharides, counterimmunoelectrophoresis (CIEP) with cytosol, and enzyme-linked immunosorbent assay (ELISA) with polyclonal and protein G conjugates and smooth lipopolysacchar...

Cystic echinococcosis (CE) is one of the most prevalent zoonotic diseases in some countries world. considered a neglected disease. This disease increases economic damage via medical costs and loss human livestock productivity. The aim current study gains better understanding prevalence CE sheep. Totally 250 sheep sera were collected. 25 serum samples from newborn lambs used as negative, others ...

To determine the role of different Brucella (B.) spp. in Bangladesh, 62 animal samples and 500 human sera were tested. Animal samples from cattle, goats and sheep (including milk, bull semen, vaginal swabs and placentas) were cultured for Brucella spp. Three test-positive human sera and all animal samples were screened by Brucella genus-specific real-time PCR (RT-PCR), and positive samples were...

The opsonophagocytic requirements of human sera containing endogenous complement for a variety of type Ia, and group B streptococcal strains were defined. Significant reduction (>==90%) in colony-forming units was noted after a 40-min incubation for the highly encapsulated, mouse-passed prototype strain 090 by sera containing moderate to high concentrations of antibody to type Ia polysaccharide...

Mannose-binding lectin-associated serine proteases-1/3 (MASP-1/3) are essential in activating the alternative pathway (AP) of complement through cleaving pro-factor D (pro-Df) into mature Df. MASP are believed to require binding to mannose binding lectins (MBL) or ficolins (FCN) to carry out their biological activities. Murine sera have been reported to contain MBL-A, MBL-C, and FCN-A, but not ...