Escherichia coli offers unparalleled engineering capacity in the context of heterologous natural product biosynthesis. However, as with other heterologous hosts, cellular metabolism must be designed or redesigned to support final compound formation. This task is at once complicated and aided by the fact that the cell does not natively produce an abundance of natural products. As a result, the m...

The problem of whether Clostridium sordellii should be assigned species status or be retained as a pathogenic variant of C. bifermentans is a perplexing one. Despite marked similarities in morphology, colony formation, and biochemical reactions (Clark and Hall, J. Bacteriol. 33:23, 1937; Stewart, J. Bacteriol. 35:13, 1938), Brooks and Epps (J. Gen. Microbiol. 21:144, 1958) were able to distingu...

The innate immune system is the first line of defense against invading pathogens. Innate cells recognize microbes via pattern recognition receptors (PRRs), such as Toll-like receptors (TLRs) and C-type lectin receptors (CLRs); initiate innate immune responses; and eventually trigger adaptive immunity. Association of heterologous PRRs synergistically enhances their signal intensity. Such PRR clu...

Heterotypic immunity to influenza virus in ferrets operated against heterotypic influenza viruses but not heterologous viruses. Contrary to prior reports, the protection conferred lasted for at least 18 months. This type of immunity limited virus shedding but did not prevent infection. These results suggest that this phenomenon could play a role in determining the severity of infections caused ...

Prior immunization of hamsters with three heterologous flaviviruses (Japanese encephalitis virus [JEV] SA14-2-8 vaccine, wild-type St. Louis encephalitis virus [SLEV], and Yellow fever virus [YFV] 17D vaccine) reduces the severity of subsequent West Nile virus (WNV) infection. Groups of adult hamsters were immunized with each of the heterologous flaviviruses; approximately 30 days later, the an...

Several hypotheses have been proposed to explain the unexpected results of the first completed efficacy clinical trial of a vaccine against dengue virus [1]. Based on intention-to-treat analyses, the vaccine was efficacious in reducing the incidence of clinical disease caused by dengue serotypes 1, 3, and 4, but failed to reduce the incidence of dengue-2 (DENV-2). The authors of the study propo...

Abstract During tumor ontogeny and viral infection, heterologous subsets of CD8+ T lymphocytes provide immediate clearance durable protection. We utilized model antigen (HIV-1-Gag) expressing melanoma cell line parabiosis to investigate the role different components memory cells, including circulating cells (T cirm) tissue-resident RM), in lung metastasis first proved that RMgenerated by DNA va...

In recent years, heterologous prime-boost vaccination constructs have emerged as a promising strategy to generate broad and protective immunity against a variety of pathogens. The utility of DNA vaccination in priming the immune system, in particular, has improved the immunogenicity of vaccines against difficult pathogens such as HIV1. In addition, many vaccine formulations include an adjuvant ...

Experiments were carried out to determine the effect of partial host immunity against the rodent malaria parasite Plasmodium chabaudi on the transmission success of the parasite. There was a fourfold reduction in both the blood-stage, asexually replicating parasite density and the gametocyte (transmissable stage) density in immunized hosts. Some of the reduction in asexual parasite densities wa...