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The validity of bioelectrical resistance body composition was determined weighing and by BR in 156 Pima Indian a wide range of body weight 46.1-202.6 and pindolol.

Looking back at the 90s an enormous amount has changed in the field of travel medicine. I will briefly look at the changes that have occurred in the vaccine arena and have a brief look at some of the drugs relating to malaria. In 1990 we did not have many of the vaccines that are available to us today, some were very restricted in their access, such as the Japanese Encephalitis vaccine and we did not have combination vaccines. Great advances have occurred in the area of Hepatitis vaccination. In the early 90s we had a good Hepatitis B vaccine but none for Hepatitis A. All we could offer was immunoglobulin. People were put off when told it was a blood product and people who were going to live in endemic areas for years were not impressed with the idea of having immunoglobulin injections every six months and indeed many did not. I personally know of a death and a second person who only lived after a liver transplant having contracted Hepatitis A as expatriates. The introduction in 1994 of a safe synthetic Hepatitis A vaccine was a big step forward for travel medicine. Mass vaccination campaigns ensued. Later in the 90s the regime changed from a three injection to a two injection regime and one manufacturer produced a combined Hepatitis A and B vaccinethree jabs instead of 5! On practical footing this created some problems explaining that a combined Hepatitis A and B vaccine could be given from one year of age but the Hepatitis A alone is only registered for two years of age upwards. In the late 90s introduction of Hepatitis B into the childhood vaccination program created more difficulties for young travellers as many having already had the Hepatitis B component had to wait until age two for the Hepatitis A alone vaccine. 1994 also saw the introduction of the purified capsular polysaccharide vaccine for typhoid. This one dose vaccine with fewer side-effects compared with the older two dose vaccine was another great advancement. The oral typhoid vaccine which had been available from the late 80s was hampered by poor compliance, although many would say that this did not alter its effectiveness. Debate also continued regarding three capsules vs four and how often re-vaccination should take place. The removal of the older killed typhoid vaccine unfortunately meant that vaccination of children under the age of two years was no longer available. The 90s also produced some competition in the vaccine market with a second Meningococcal meningitis vaccine, choices of manufacturers for Hepatitis A vaccine, and a second manufacturer typhoid vaccine. With the outbreak of Japanese Encephalitis in Torres Strait in 1995 we saw the full registration of the Je-Vax in Australia. Prior to this it was only available to a select group of clinics and many potential travellers were put off by having to sign disclaimers. The 90s also saw severe shortages of Human Rabies immunoglobulin worldwide. The late 90s saw the introduction of the chicken pox vaccine into the Australian market. Whilst many may not think this to be to relevant to travel I can assure you that a number of expatriates who have previously eluded the disease manage to contract Chicken pox whilst abroad. There has not been much change in the TB arena except for a widening approach to only vaccinate the under five year old traveller proceeding on to an endemic area. Obviously, screening remains critical in the surveillance of TB in travellers and expatriates. With a vaccine providing only partial protection for a short period everyone was eager to hear of the new oral cholera vaccine. However, the short term protective effect of the new vaccine with some strains left uncovered meant a smaller than expected uptake. We continue to hear of research into Dengue and Malaria vaccines but to date nothing has emerged on the commercial front for these two diseases. In the area of malaria two drugs have been largely abandoned. Maloprim usage continued to decline.

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The purpose of this review is to consider the toxicology animal and human ; , metabolism, excretion, and exposures of humans to PEG and to evaluate the safety of the PEG on PEGylated proteins to those exposed to these biological products. The feasibility of conducting ADME studies will also be considered, as well as any value they would bring to the risk assessment. Toxicology of Polyethylene Glycol in Animals Acute, short-, and long-term toxicology studies with PEGs administered by the oral, intraperitoneal, and intravenous routes in a wide range of animal species have been carried out with PEGs with molecular weights of up to 10, 000. The toxicity of PEG has been thoroughly reviewed Fruijtier-Polloth, 2005 in light of this, a brief summary of the toxicology of PEG is given below. After acute administration, the LD50 values of PEG are generally in the region of 10g kg or higher. The clinical signs associated with this acute exposure include jumping, tremors, convulsions, piloerections, and dyspnea. Postmortem examination showed pulmonary hyperemia and edema Fruijtier-Polloth, 2005 ; . Acute poisoning in rabbits suggests that poisoning occurs at plasma concentrations in excess of 30 to Herold et al., 1989 ; . In chronic oral toxicology studies in the rat, PEG1500 0.06 g kg day ; and PEG4000 0.02 g kg day ; did not cause any significant adverse effects after 2 years' administration Smyth et al., 1955 ; . When PEG1540 and 4000 were administered as part of the diet 4% ; to rats, no effects were observed Smyth et al., 1955 ; . Experiments with PEG400 showed no effect at doses of 2% in diet, with higher doses showing nonspecific effects on growth and cloudy swellings in the liver Smyth et al., 1955 ; . These data indicate that after chronic administration to the rat PEG is not a significant toxicological concern. In chronic toxicology studies in nonrodent species there were no adverse events in dogs that received PEGs ranging from 400 to 4000 molecular weight 2% in diet ; for a year Smyth et al., 1955 ; . In the monkey, PEG200 caused pathological lesions during a 13-week study in the kidney at an oral dose of 2.2 to 4.4 g kg. The renal lesions consisted of intratubular deposition of oxalate crystals in the renal cortex but were not associated with other clinical or pathological findings Prentice and Majeed, 1978 ; . Adverse effects have also been observed in monkeys treated by intravenous infusion 1 ml h ; for up to 1 month with 60% PEG400 in water approximately 3 g kg day ; . At this dose, the monkeys had reduced appetite, a greasy texture of their lower extremities, edema of their genitalia and legs, and deteriorating infusion sites Working et al., 1971; Fruijtier-Polloth, 2005 ; . These data indicate the excellent safety profile of PEG when administered chronically to nonrodent species. No adverse reproductive or teratogenic effects are reported with PEGs. Polyethylene glycols are neither mutagenic nor carcinogenic Working et al., 1971; Fruijtier-Polloth, 2005 ; . Toxicology of PEGylated Molecules in Animals Preclinical toxicology studies performed with PEGylated proteins have also not revealed any PEG-specific toxic findings. For example, with PEG-interferon, the toxicity profile was evaluated in cynomolgus.