Dynamics of Anti-S IgG Antibodies Titers after the Second Dose of COVID-19 Vaccines in the Manual and Craft Worker Population of Qatar.

There is limited seroepidemiological evidence on the magnitude and long-term durability of antibody titers of mRNA and non-mRNA vaccines in the Qatari population. This study was conducted to generate evidence on long-term anti-S IgG antibody titers and their dynamics in individuals who have completed a primary COVID-19 vaccination schedule. A total of 300 male participants who received any of the following vaccines BNT162b2/Comirnaty, mRNA-1273, ChAdOx1-S/Covishield, COVID-19 Vaccine Janssen/Johnson, or BBIBP-CorV or Covaxin were enrolled in our study. All sera samples were tested by chemiluminescent microparticle immunoassay (CMIA) for the quantitative determination of IgG antibodies to SARS-CoV-2, receptor-binding domain (RBD) of the S1 subunit of the spike protein of SARS-CoV-2. Antibodies against SARS-CoV-2 nucleocapsid (SARS-CoV-2 N-protein IgG) were also determined. Kaplan-Meier survival curves were used to compare the time from the last dose of the primary vaccination schedule to the time by which anti-S IgG antibody titers fell into the lowest quartile (range of values collected) for the mRNA and non-mRNA vaccines. Participants vaccinated with mRNA vaccines had higher median anti-S IgG antibody titers. Participants vaccinated with the mRNA-1273 vaccine had the highest median anti-S-antibody level of 13,720.9 AU/mL (IQR 6426.5 to 30,185.6 AU/mL) followed by BNT162b2 (median, 7570.9 AU/mL; IQR, 3757.9 to 16,577.4 AU/mL); while the median anti-S antibody titer for non-mRNA vaccinated participants was 3759.7 AU/mL (IQR, 2059.7-5693.5 AU/mL). The median time to reach the lowest quartile was 3.53 months (IQR, 2.2-4.5 months) and 7.63 months (IQR, 6.3-8.4 months) for the non-mRNA vaccine recipients and Pfizer vaccine recipients, respectively. However, more than 50% of the Moderna vaccine recipients did not reach the lowest quartile by the end of the follow-up period. This evidence on anti-S IgG antibody titers should be considered for informing decisions on the durability of the neutralizing activity and thus protection against infection after the full course of primary vaccination in individuals receiving different type (mRNA verus non-mRNA) vaccines and those with natural infection.

Gemella morbillorum endocarditis.

A case of Gemella morbillorum (G.morbillorum) endocarditis of the mitral valve in a patient with previously normal heart valves is reported. The presentation was subacute, and the infection was complicated by perforation of the posterior mitral leaflet that necessitated valve repair. Gemella morbillorum infections are uncommon, and endocarditis is the most common presentation. G.morbillorum endocarditis is probably under recognized, and has not been reported from our region. The case is described, and problems in the identification of the organism are discussed.

Epidemiology of neonatal meningitis in Qatar.

OBJECTIVE: Neonatal meningitis is responsible for thousands of neonatal deaths annually all over the world. Our study was conducted to determine the epidemiology, management and best preventive measures for neonatal meningitis in Qatar. METHODS: A retrospective study reviewed the records of bacterial meningitis patients under the age of one month. The study was carried out at Hamad Medical Hospital, the only hospital that provides health care at Qatar and the study period was between January 1998 to December 2000. RESULTS: Thirteen patients were included. Sixty percent of patients had early onset meningitis. Causative organisms were group B Streptococcus pneumoniae, Klebsiella pneumonia, Pseudomonas species, Neisseria meningitidis, Staphylococcus epidermidis and Flavibacterium meningococcus septicum. A bacterial resistance to the usual combination of ampicillin and gentamicin were noticed (as initial treatment before culture sensitivity results), which affected negatively on some patients. Complications of cerebral palsy, mental retardation and epilepsy occurred in 3 patients (23%). None of the patients died during the study period. CONCLUSION: Emphasis is placed on the importance of correct early diagnosis and appropriate antibiotic therapy. It is suggested that the identification and appropriate treatment of any maternal bacterial infection is an important measure in preventing neonatal sepsis and meningitis.

Epidemiology of neonatal meningitis in Qatar.

OBJECTIVE: Neonatal meningitis is responsible for thousands of neonatal deaths annually all over the world. Our study was conducted to determine the epidemiology, management and best preventive measures for neonatal meningitis in Qatar. METHODS: A retrospective study reviewed the records of bacterial meningitis patients under the age of one month. The study was carried out at Hamad Medical Hospital, the only hospital that provides health care at Qatar and the study period was between January 1998 to December 2000. RESULTS: Thirteen patients were included. Sixty percent of patients had early onset meningitis. Causative organisms were group B Streptococcus pneumoniae, Klebsiella pneumonia, Pseudomonas species, Neisseria meningitidis, Staphylococcus epidermidis and Flavibacterium meningococcus septicum. A bacterial resistance to the usual combination of ampicillin and gentamicin were noticed (as initial treatment before culture sensitivity results), which affected negatively on some patients. Complications of cerebral palsy, mental retardation and epilepsy occurred in 3 patients (23%). None of the patients died during the study period. CONCLUSION: Emphasis is placed on the importance of correct early diagnosis and appropriate antibiotic therapy. It is suggested that the identification and appropriate treatment of any maternal bacterial infection is an important measure in preventing neonatal sepsis and meningitis.