Seasonal pattern in childhood viral lower respiratory tract infections in Melbourne

Respiratory syncytial virus and parainfluenza viruses are the major pathogens in acute lower respiratory infection in infants and younger children. They show distinct seasonal patterns. An annual epidemic of respiratory syncytial virus infection is seen in Melbourne and this coincides with the coldest months of the year. Parainfluenza virus Type 1, the most frequent cause of laryngotracheobronchitis, occurs as an autumn epidemic every second year. Parainfluenza virus Types 2 and 3 are present most years and do not show a clear seasonal pattern.

[Pathological-anatomical findings in 70-102 years old Caucasians (author's transl)]

The macroscopic findings of 2385 autopsy protocolls of 70-102 year-old males and females were analysed for frequency and functional significance of diseases. 1. Severe coronary arteriosclerosis was found up to 60% of the cases, with increasing frequency in higher age groups. However decrease of acute myocardial necrosis was stated including the highest age group. 2. The mean values of heart weights decrease in the highest age groups. 3. While the frequency of arteriosclerosis in the cerebral arteries increases the frequency of ischemic lesions of the brain decreases. 4. Benign hyperplasia of the prostate is found in 85% of the cases. 5. 80% of the patients had severe substantial chronic pulmonary emphysema and acute tracheobronchitis. These pulmonary lesions are supposed to be the functionally most important disease in patients of old age.