Effects of levamisole dilutions on HA of Newcastle Disease virus were studied in vitro and the findings are: 1. Treatment period 4 hours (at room temperature) - 1.1 When levamisole were mixed up to make final dilutions of 0.02 and 0.05% with NDV, no effect on HA was apparent; 1.2 When the final dilutions were 0.1, 0.25, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5 and 4.0%, the HA dropped significantly; 1.3 When the final dilution were 4.5 and 5.0% all HA activities of the NDV were destroyed. 2. At final dilution 0.02% levamisole did not affect the HA when the NDV were treated for 24 hours at room temperature. 3. HA activities of NDV was usually affected when NDV were treated longer than 4 hours when the final dilutions of levamisole were higher than 2.0%. Levamisole dilution should not exceed 0.1% when it is used as ND Vaccine diluent.

Incidence of hydropsy-chick affected flocks from 12 commercial broiler farms in Chon-Buri Chachoeng-Sae and Samutprakarn was recorded. The age of chicks affected with hydropsy syndrome ranged from two to six weeks. The mortality rate was low (5-25%) and reached the peak when chicks were about four weeks of age. In all studied flocks, there had been previously an attack of pulmonary aspergillosis during the first week of life. The hydropsy chicks, at necropsy, showed ascites, hydropericardium, cardias dilatation -hydropericardium, cardiac dilatation with prominent nodular thickening of A-V valves and severe lung edema. Microscopic sections of the lungs revealed diffuse foci of Aspergillus-granulomata.

The outbreak of saprolegniasis in the experimental clariid catfish (Clarias batrachus) was observed in the fish diseases laboratory. The spread of this fungal disease was very rapid. The mortality and morbidity were 45% and 90% respectively. The sand goby (Oxyeleotris marmoratus) was considered as the source of disease. The infection disappeared in 9 days after the initial detection of the moribund catfish. The clinical signs, pathological appearance and the characteristics of the causative fungi were described.

Culture of the giant freshwater prawn in three different systems were comparatively studied. These culture systems are: 1) a large earthen pond; 2) nylon cages submerged in an irrigation canal; and 3) a longitudinal ditch located in an orchard. Each culture system was initially stocked with juvenile prawns at 5 prawns/m2. The prawns were fed with a compound diet at the same ratio for the experimental period of six months. The results showed a significant difference on growth among these three systems. The prawns reared in cages exhibited the poorest growth while those of the other two systems exhibited better and comparable growth. Nevertheless, the prawn reared in cages showed the best survival (52.5%). Survival of prawn reared in the earthen pond and the longitudinal ditch were 48.0% and 35.2%, respectively. The yield per rai (0.16 ha) per crop (six months) of these three systems were 210 kg, 138 kg, and 74 kg, respectively. The factors affecting growth, survival, and production of the prawn are discussed.

A report of an outbreak of Aspergillus among 100,000 young chicks in a farm was presented. The mortality rate was 6 percent with pulmonary system, and about 4 percent were opthalmic lesions in either left or right side of the eye. The yellowish diphtheriatic membrane which is attached to the conjunctiva under the third eye lid contained numerous branching septated hyphae of Aspergillus fumigatus. Histopathological examination of the affected eyes revealed inflammation of the conjuctiva, third eye lid, choroid and iris. Abundance of mononuclear cells and heterophils were observed in the affected tissue. Opacity of the cornea showed evidence of edema, heterophils infiltration and ulceration. The upper part of the wing of the same side of the affected eye were wet and dirty due to deposition of tear and dust.

The authors reported an outbreak of infection occurring in a small poultry laying farm without obvious symptoms of sick birds. The mortality rate within a few week-period of onset was up to 50%. Post mortem examinations were conducted and the lesions were described. With the aid of bacteriological confirmation including biochemical and pathogenicity test, the cause of the disease was found to be Pasteurella multocida. None of the birds died after one-week treatment and management.

The adverse effects of Monensin sodium and Troleandomycin in commercial broiler chickens in a commercial farm, confirmed by experimentation, were exhibited as sudden onset, leg weakness, prostration, unable to stand up and death. Morbidity rate was 30%, mortality rate was over 10%. Postmortem examination of these birds showed no significant lesions.