Characterization of an enterovirus associated with acute infectious lymphocytosis.

An enterovirus (EVU-16) previously isolated from children with acute infectious lymphocytosis has been further characterized. The EVU-16 virus sediments as a 135S particle in sucrose gradients, has a density of 1-335 g/ml in CsCl, contains 4 polypeptides and has a single stranded RNA genome sedimenting at 35S. These structural features as well as the presence of a virus-related particle, the procapsid, are similar to those of other enteroviruses.

A continuing common-source outbreak of botulism in a family.

In December, 1974, three cases of botulism occurred in a family; two were fatal. The first patient died after a 10-day illness without botulism being suspected. 4 days later, after a 2-day illness, the second patient was diagnosed as having botulism after a cardiorespiratory arrest; she died 3 days later.

Staphylococcal food poisoning aboard a commercial aircraft.

On Feb. 3, 1975, 196 (57%) of 344 passengers and 1 steward aboard a commercial aircraft contracted a gastrointestinal illness characterised by nausea, vomiting, abdominal cramps, and diarrhoea; 142 passengers and the steward were admitted to hospital. Symptoms developed shortly after a ham and omelette breakfast had been served.

Location of the origin of DNA replication in adenovirus Type 2.

Utilizing the isolated left and right halves of both adenovirus type 2 and the nondefective adenovirus simian virus 40 hybrid (Ad2(+)ND(1)), studies were undertaken to find the site on the DNA molecules at which replication begins. The data are consistent with several models which include an initiation event at both ends and bidirectional growth.

Synthesis of type 2 adenovirus DNA in the presence of cycloheximide.

Adenovirus type 2 DNA synthesis, either in permissive human cells or nonpermissive monkey cells, becomes independent of protein synthesis after the appearance of progeny viral DNA. In the presence of cycloheximide, semiconservative replication and initiation of progeny molecules can occur.

Studies of the mechanism of enhancement of human adenovirus infection in monkey cells by simian virus 40.

The defect which prevents human adenovirus replication in monkey cells and the mechanism whereby this restriction is overcome by coinfection with simian virus 40 (SV40) have been studied. Adenovirus capsid proteins are not synthesized efficiently in monkey cells in the absence of SV40. Adenovirus "enhancement" by SV40 was found to be the product of increased efficiency of replication by a small percentage of cells.

Intermediates in the synthesis of type 2 adenovirus deoxyribonucleic acid.

Intermediates in the synthesis of adenovirus type 2 deoxyribonucleic acid (DNA) were studied in HeLa cells. Pieces of DNA smaller than the viral genome were demonstrated after labeling with (3)H-thymidine for 10 to 240 sec. Intermediates as small as the Okazaki fragments (8 to 10S) do not predominate at any of the above times.

Molecular weight of Adenovirus type 2 hexon polypeptide.

The fully dissociated hexon polypeptide of adenovirus type 2 has a molecular weight of 129,000 (+/-10,000) daltons as determined by high-speed sedimentation equilibrium in 6 m guanidine.