Developmental neuroethology: changes in escape and defensive behavior during growth of the lobster.

The changes in relative efficacy of two incompatible behaviors was investigated during growth of the lobster, Homarus americanus. In larval and early juvenile stages, physiological and morphological factors favor use of the escape response over defensive behavior. In large animals, defensive behavior is preferred almost exclusively to escape behavior unless the claws are lost. The interaction of escape and defensive behavior is modified by neural and morphological factors, which are dependent on the stage in the life cycle of the organism.

Thrush can be prevented in patients with acquired immunodeficiency syndrome and the acquired immunodeficiency syndrome-related complex. Randomized, double-blind, placebo-controlled study of 100-mg oral fluconazole daily.

Recurrent oropharyngeal candidiasis is common in patients with acquired immunodeficiency syndrome and the acquired immunodeficiency syndrome-related complex. It causes local pain and discomfort, loss of taste, and aversion to food and may lead to secondary complications. We examined, in a double-blind study, whether recurrent thrush could be prevented by prophylaxis. Twenty-five patients with one to four previous thrush episodes who had no thrush at the outset of the study were randomized to receive 100 mg of fluconazole or placebo daily for 12 weeks. If thrush occurred, prophylaxis was stopped and patients were treated conventionally, after which prophylaxis was resumed. After the randomized study, some patients were given continuous fluconazole (open phase). In the randomized study, thrush occurred in eight of 13 placebo-treated patients and none of 12 fluconazole-treated patients. Possible side effects were not different between the groups. Dermatophytosis and onychomycosis and cryptococcuria also improved in the fluconazole-treated patients, and fungal colonization was significantly decreased. One episode of thrush occurred in the open phase in an intermittently compliant patient (group total, 71.5 patient-months of fluconazole treatment); in contrast, the 25 patients also had had two episodes of Candida esophagitis, three of cryptococcosis, and 13 of dermatophytosis before entry. Subsequent to entry in the randomized trial, in 92.3 patient-months without fluconazole, there were 35 episodes of thrush, one of esophagitis, one of cryptococcemia, and one of dermatophytosis, and preexisting dermatophytosis and onychomycosis were unchanged or worsened. Individual patients observed with and without fluconazole treatment also showed its efficacy. In conclusion, thrush can be prevented in patients with acquired immunodeficiency syndrome and the acquired immunodeficiency syndrome-related complex with negligible toxic effects. Larger trials to confirm prevention of all mycoses with prophylaxis should be considered.

Low-dose dapsone prophylaxis of Pneumocystis carinii pneumonia in AIDS and AIDS-related complex.

The efficacy, toxicity and cost of orally administered dapsone (50-100 mg/day) for prophylaxis of Pneumocystis carinii pneumonia (PCP) were evaluated in 30 patients with AIDS or AIDS-related complex (ARC). Six patients received primary and 24 secondary prophylaxis. Ten patients received a maximum dose of 100 mg/day and 20 a maximum of 50 mg/day for a median duration of 19 weeks; 22 of the 30 patients continue to receive prophylaxis as of May 1989. Four patients have died, none of pneumocystis infection. One patient with AIDS suffered a mild relapse while receiving 50 mg/day. Hematologic toxicity was mild and could not be definitively attributed to dapsone therapy; rash due to dapsone was documented in two patients. A review of 33 patients at our institution with a history of PCP who received no prophylaxis demonstrated seven relapses, three of which were fatal. Cost analysis revealed a significant advantage for oral dapsone over aerosolized pentamidine.