Treatment of a child with pseudomembranous colitis depends on the severity of disease. Mild cases require cessation of antibiotics and supportive therapy with fluids and electrolytes. Evaluate patients with severe or persistent antibiotic-associated colitis for C difficile toxin in the stool.
OptiFine allows zooming in by pressing the Control key. The closest thing in vanilla Minecraft is to use a bow and arrow, and aim the bow toward where you want to look, and to fire it when you are done looking.
You don't make an End Portal, you find it. They're hidden in Strongholds and to locate one you'll need to make some Eye of Ender - Minecraft Wiki. Holding an Eye of Ender in your hand and right-clicking will make it fly up in the air and show you in which direction you'll have to travel in order to find the End Portal.