Great White shark trophic PYRAMID: 1  Trophic Pyramid Information that is in video: An ecological pyramid (also trophic pyramid, energy pyramid, or sometimes food pyramid) is a graphical representation designed to show the biomass or biomass productivity at each trophic level in a given ecosystem.
For a vaginal yeast infection that recurs within 2 months of treatment, or four times in 1 year (recurrent vaginal yeast infection), see your doctor. Further testing or a different treatment may be needed. If you have been using a nonprescription medicine for your vaginal symptoms, be sure to tell your doctor.
1 Antibiotics. 2  Taking antibiotics is one of the most common causes of a vaginal yeast infection. 3  Antibiotics and some other medications change the level of bacteria and other organisms in the vagina -- such as the bacteria lactobacillus acidophilus, which normally helps keep yeast cells under control. Pregnant women have high levels of estrogen, which can cause a yeast infection during pregnancy. 2  Other changes in hormone levels. 3  Taking hormone replacement therapy (HRT) or birth control pills changes the balance of hormones in the body, especially estrogen and progesterone.