| seasonal changes in density and tissue distribution of onchocerca cervicalis microfilariae in ponies and related changes in culicoides variipennis populations in louisiana. | seasonal changes in density and spatial distribution of onchocerca cervicalis microfilariae were studied in ventral-midline skin of 15 infected pony mares in southern louisiana. triple running mean analysis of data over a 13-mo period indicated that a distinct pattern exists in total microfilariae population density and in microfilariae occurrence in different levels of the dermis. microfilariae density reaches peak levels in the spring followed by a 58% decrease in the summer, a 19% increase in ... | 1987 | 3585627 |