This study was conducted to observe the regional difference of the prevalence of influenza. The sampled regions of this study were Sashima area, Ibaragi Prefecture and Shonai area, Yamagata Prefecture. In this study, HI antibody value in the serums sampled as the same time from the populations in both areas was determined. Strains of influenza virus in this experiment were A/Aichi/2/68 strain, A/Tokyo/6/73 strain, A/Yamanashi/20/75 strain, B/Tokyo/7/66 strain, B/Yamagata/1 773 strain, B/Gifu/2/73 strain, and B/Kanagawa/3/76 strain, which were prevailed in Japan in the past. In addition, to study the possibility of the re-prevalence of influenza due to the strains prevailed in the past, coutermeasure against Swine type influenza virus (HswlNl type strain) which now draws interest of the persons concerned was discussed. Consequently, it was confirmed that there were regional differences with different types of epidemic strains. In other words, A-type strain was presumed to have caused a severe prevalence in Sashima area then in Shonai area. In Shonai area, invasion and prevalence of the virus were confirmed, but the prevalence of that influenza was presumed to have been of moderate degree. Nearly the same tendency as with A-type strain was seen with B-type strain, while Shonai area was found as a result of the.serological analysis to have experienced a larger prevalence with B/Tokyo/7/66 strain. On the other hand, the possessed antibody to A/New Jersey/8/76 strain mostly indicated the past prevalences, while some relation with the pig was suggested in other cases, but the study failed to make confirmation for all cases.
Changes in growth in regards to historical period were examined using Ministry of Education statistics. Furthermore, results of investigation concerning future possibilities as against the recent of appearance growth acceleration are also presented as follows.1) The phenomena of growth acceleration and retardation can be observed, not by viewing data in terms of date of birth, but by measurement year, in other words, these phenomena are governed not by the individuals age, but according to period of history.2) Growth acceleration was not were acceleration but appears as growth advancement.3) Growth degeneration at the beginning of World War II and degeneration in 1937 and 38 were due in large measure to the affects of natural calamity.4) The state in the post-war period was a re-appearance of the Meij i Era. Recovery in the immediate post-war years can be thought to be the result of improvement in individual nutrition, and this correlates to the average living conditions in pre-war years. After this, nutritional improvement in the mother's body became a factor and growth acceleration was maintained. However, from 1964, which can be seen as a return to the living conditions of the early Showa Era, growth acceleration became slowed and the present increase in height can be considered a natural tendency and no longer viewed as growth acceleration .5) The influence of unfavorable nutritional conditions in the final growth stage inhibits final height, but unfavorable influences in eariler growth stages seem to be remedied by nutritional improvement.6) It was seen that, besides the nutrition of the individual, the nutritional improve ment of the mother has a great effect on the child.