THE MICROSCOPE PATHOGEN IDENTIFICATION
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- Moris Stafford
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2 CONTENTS 5 ABOUT THE AUTHOR 5 ACKNOWLEDGEMENTS 6 OVERVIEW 6 What is the Purpose of this Book? 6 What are the Limitations of Light Microscopy as a Diagnostic Tool? 7 When Should I Contact a Veterinarian? THE MICROSCOPE 8 Types of Microscopes 9 Parts of the Microscope Eyepiece (Ocular) Lenses Optical Tube Rotating Objective Lenses (Lens Turret) Stage Focus Control Sub-stage Condenser Iris Diaphragm Light Source 11 How to Get the Best from Your Microscope Cleaning Storage 12 Basic Sample Examination Equipment 12 Special Techniques Manipulating Light Intensity Using an Immersion Oil Lens Gram Staining 14 Selection of Samples 14 Fresh Smear Samples 16 Faecal Flotation 17 Use of the Microscope 18 Interpretation of Results PATHOGEN IDENTIFICATION 23 INTRODUCTION 23 Appearance of Faecal Smears 23 Common Background Material 24 Thick Smear Sample 24 Faecal Flotation Specimen
3 AVIAN PATHOGENS 25 Roundworms 26 Threadworms 27 Gizzard worms 28 Tapeworms 28 Caecal worm 29 Megabacteria 30 Yeast 32 Motile flagellate protozoa 33 Coccidia 34 Gram-positive smear 34 Gram-negative smear 35 Histopathology REPTILE PATHOGENS 36 Motile flagellate protozoa 37 Coccidia 38 Embryonated strongyloid-type eggs 38 Strongyloides spp. 39 Pinworms 40 Roundworms 41 Threadworms 41 Tapeworms ARTIFACTS/PSEUDOPARASITES 42 Urate crystals 43 Air bubbles 44 Pollen 45 Blood cells 46 Powder down 46 Fungal elements 47 Feather fragments 48 Hair fragments 49 Plant material 51 Pond water organisms 52 Mites
4 underneath (bottom piece of bread), a thin single layer of cheese (the sample) and a coverslip (piece of bread) on top. If we were able to look through the top surface (coverslip/top piece of bread) we should see one layer of finely distributed sample (cheese) and the bottom surface (slide/bottom piece of bread). What we do not want to see is the sample so thick and multilayered that, when viewed from above, allows us to see the top layer of the sample (cheese) but nothing underneath (subsequent layers of cheese). If this happens, we have no idea what is present in the subsequent layers. Other samples such as vomitus or oral mucous may be examined in the same way. In order to achieve this ideal monolayer sample we must dilute and suspend the sample in a thin layer of liquid. The ideal liquid for all samples is lightly warmed saline solution (as used in intravenous fluid bags). This is not disruptive to any cellular membranes and will encourage survival of even the most fragile organisms. Bottled or tank water is the next best choice. Tap water will suffice for most situations but the chemicals in it will often rapidly kill sensitive pathogens such as protozoan flagellates. The technique I use for preparing a sample for examination is as follows: 1. Collect a small piece of characteristic faecal material (or whatever you are examining). The usual amount is enough to cover one side of a matchstick head (or about 1/25 of a coverslip surface area). Pick this up with the corner of the coverslip or any firm object and place it in the centre of one end of the slide. 2. Using an eyedropper, dropper bottle, syringe or the tip of your finger, place one drop of diluting fluid (saline/water) onto the top of the small faecal sample on the slide. 3. Use the edge of the coverslip to mix the sample and the diluting fluid to a weak soup consistency. 4. Place the coverslip over the mixed drop and allow the sample to spread out. If done correctly there should be just enough fluid to allow the sample to spread out under the coverslip without applying any pressure on it. If not mixed properly, or if there is non-organic material in the sample such as sand particles, the coverslip will sit up on one or more edges allowing air to become trapped under the slide. 5. Manipulate the coverslip with your finger, using gentle pressure in the centre until most air bubbles and any gritty material have been pushed to the side of the coverslip. Your coverslip should now cover a drop of liquid with a single layer of suspended material. 15 A: An excessively thick or multilayered slide sample may obscure the item being viewed. B: A monolayer presents a finely distributed slide sample for clear visual examination
5 UNDER THE MICROSCOPE Interpretation of Results Using a microscope correctly is only half of the battle. The most difficult point for most people to understand and appreciate is that a faecal sample contains more than just what we are looking for. It contains all of the waste from the gastrointestinal tract including undigested food, digestive bacteria, plant material, insect parts, feather and hair remnants and anything that is pathogenic. Your first view down a microscope will reveal any or all of these in a single view. The hard part is knowing what to ignore. All this extra material is background material in which you need to find a specifically shaped organism. The pictorial section which follows will not only show what the most common pathogens look like but will also show what to expect in background material, including some confusing structures that we like to refer to as pseudoparasites (because they Red arrows: Roundworm egg. Light blue arrows: Feather fragments. Dark blue arrows: Plant cell walls. are often mistaken for parasites). The pictorial examples will deal mainly with parasitic diseases in birds and reptiles as well as some fungal infections in birds. These are split into Avian and Reptile sections to avoid confusion. Also included are some examples of Gram stained bacteria. They are included here for demonstration purposes, so that you will understand what your veterinarian means by Gram-positive and Gram-negative infections. (See also Special Techniques, page 12) Many birds and reptiles in the wild have parasitic burdens but never develop a parasite-related disease. This is because it is unlikely that they are able to build up the numbers of parasites in the wild that they can develop in captivity. For example, a finch or 18
6 Roundworms (Ascarids) Generally, the oval-shaped eggs are large and thick-walled. The mottled central area is generally plumper and rounder in shape. They are likely to be the largest parasite eggs you will see. Found mainly in parrots, pigeons and poultry. AVIAN PATHOGENS Roundworm egg (40X) sample from a Princess Parrot light burden. Roundworm eggs (40X) sample from a Budgerigar heavy burden. Roundworm egg (100X) sample from a Princess Parrot. Roundworm egg (100X) sample from a Budgerigar. 25
7 UNDER THE MICROSCOPE REPTILE PATHOGENS Motile flagellate protozoa (Trichomonas and other species) All of these organisms have several features in common and appear similar under light microscopy. They have a circular to teardrop-shaped body along which are attached a series of waving appendages (flagella). The site of attachment of these flagella (front, back or midline) can be used as a rough guide to distinguish the species. These flagella are whipped around and propel the organism rapidly across the microscope field of view. Depending on the position of the flagella they will spiral, spin, rotate, gyrate, rocket or move like a falling leaf. They are very small and are difficult to see under less than 400X magnification. They also stop moving and die quickly once the faecal sample cools. Fresh warm faeces are best for identifying these organisms. There is little difference in the appearance of these organisms in both birds and reptiles. To get an appreciation of these organisms, collect and prepare a fresh warm dropping from a common household fence (or garden) skink. These commonly have very high natural flagellate burdens. Motile flagellate protozoa (400X) sample from a Stripetailed Monitor (See also page 32). Red arrows: Flagellate protozoa organisms. Motile flagellate protozoa (1800X) sample from a Tiger Snake. This highly magnified view shows in detail the features of these organisms. The waving flagella should be visible at X magnification. 36
8 UNDER THE MICROSCOPE ARTIFACTS/ PSEUDO- PARASITES Knowing what to ignore in a sample is as important as knowing what to identify. The following views portray many of the more common items that are often misidentified as parasites due to similarity of shape, regularity of their appearance or high density on slides (See Interpretation of Results on page 18). Both avian and reptile pseudoparasites will be identified as many of these are common to both types of faecal examinations. Urate crystals Both birds and reptiles excrete nitrogenous waste in the form of urates (the white part of the droppings). Understandably, this often contaminates faecal samples. The individual crystals may be seen in massive amounts. They appear as circular structures, often with an internal crystalline or star pattern. They have no cell wall and will vary in size. They are most often mistaken for coccidia. Urate crystals (100X). Red arrows: Urate crystals. Light blue arrows: Budding yeast organisms. 42
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