The Middle East Respiratory Syndrome-coronavirus (MERS-CoV) causes a highly lethal pneumonia. MERS was recently identified as a candidate for vaccine development but most efforts focus on antibody responses, which are often transient after CoV infections. CoV-specific T cells are generally long-lived but the virus-specific T cell response has not been addressed in MERS patients. Here, we obtained PBMCs and/or sera from 21 MERS survivors. We detected MERS-CoV-specific CD4 and CD8 T cell responses in all MERS survivors and demonstrated functionality by measuring cytokine expression after peptide stimulation. Neutralizing (PRNT50) antibody titers measured in vitro predicted serum protective ability in infected mice and correlated with CD4 but not CD8 T cell responses; patients with higher PRNT50 and CD4 T cell responses had longer ICU stays and prolonged virus shedding and required ventilation. Survivors with undetectable MERS-CoV-specific antibody responses mounted CD8 T cell responses comparable to those of the whole cohort. There were no correlations between age, disease severity, co-morbidities and virus-specific CD8 T cell responses. In conclusion, measurements of MERS-CoV-specific T cell responses may be useful for predicting prognosis, monitoring vaccine efficacy and identifying MERS patients with mild disease in epidemiological studies and will complement virus-specific antibody measurements.

pThe molecular epidemiology and mechanisms of resistance of carbapenem-resistant Enterobacteriaceae (CRE) were determined in hospitals in the countries of the Gulf Cooperation Council (GCC), namely, Saudi Arabia, United Arab Emirates, Oman, Qatar, Bahrain, and Kuwait. Isolates were subjected to PCR-based detection of antibiotic-resistant genes and repetitive sequence-based PCR (rep-PCR) assessments of clonality. Sixty-two isolates which screened positive for potential carbapenemase production were assessed, and 45 were found to produce carbapenemase. The most common carbapenemases were of the OXA-48 (35 isolates) and NDM (16 isolates) types; 6 isolates were found to coproduce the OXA-48 and NDM types. No KPC-type, VIM-type, or IMP-type producers were detected. Multiple clones were detected with seven clusters of clonally related Klebsiella pneumoniae. Awareness of CRE in GCC countries has important implications for controlling the spread of CRE in the Middle East and in hospitals accommodating patients transferred from the region.

(1). The success of this pathogen is partially due to the high prevalence of a multidrug-resistant phenotype that A. baumannii now demonstrates (2). In the Middle East, particularly in states of the Cooperation Council for the Arab States of the Gulf (Gulf Cooperation Council [GCC]; i.e., Saudi Arabia, United Arab Emirates, Oman, Kuwait, Qatar, and Bahrain), the prevalence of carbapenem-resistant A. baumannii (CRAB) has increased dramatically over the last decade (3). This high prevalence limits treatment options, which can lead to increased morbidity and mortality due to infections caused by CRAB.The phenotypic resistance characteristics of CRAB are mainly due to the expression of class D carbapenemases, called oxacillinases. Moreover, plasmid-mediated metallo-␤-lactamases (MBL) have been associated with the resistance phenotype (2). The existence of ISAba1 elements upstream of the bla OXA-51-type gene is also associated with the carbapenem resistance phenotype in A. baumannii by overexpressing the intrinsic OXA-51 carbapenemase (4). Previous reports on isolates from the GCC states show that the carbapenem resistance phenotype in A. baumannii is often due to the expression of OXA enzymes, particularly OXA-23 (3). However, MBL-encoding genes, including the recently